diff --git a/lam/docs/manual-sources/chapter-modules.xml b/lam/docs/manual-sources/chapter-modules.xml
index f0265e89..e80b4cce 100644
--- a/lam/docs/manual-sources/chapter-modules.xml
+++ b/lam/docs/manual-sources/chapter-modules.xml
@@ -5127,6 +5127,71 @@ OK (10 msec)</programlisting>
       </mediaobject>
     </screenshot>
 
+    <para><emphasis role="bold">Constant value</emphasis></para>
+
+    <para>This will set the attribute to a constant value. You can also
+    specify wild cards to inject other attribute's values:</para>
+
+    <para>Wildcards</para>
+
+    <itemizedlist>
+      <listitem>
+        <para>%attribute%: attribute value</para>
+      </listitem>
+
+      <listitem>
+        <para>@attribute@: first character of attribute</para>
+      </listitem>
+
+      <listitem>
+        <para>?attribute?: first character of attribute in lower case</para>
+      </listitem>
+
+      <listitem>
+        <para>!attribute!: first character of attribute in upper case</para>
+      </listitem>
+
+      <listitem>
+        <para>??attribute??: attribute in lower case</para>
+      </listitem>
+
+      <listitem>
+        <para>!!attribute!!: attribute in upper case</para>
+      </listitem>
+
+      <listitem>
+        <para>(attribute): space if attribute is set</para>
+      </listitem>
+
+      <listitem>
+        <para>§attribute|;§; attribute values separted by ";" (you can set
+        other separators if you want)</para>
+      </listitem>
+    </itemizedlist>
+
+    <para>Examples for attributes gn="Steve", sn="Miller" and
+    memberUid=("user1", "user2") (specified value -&gt; resulting LDAP
+    value):</para>
+
+    <itemizedlist>
+      <listitem>
+        <para>"my constant" -&gt; "my constant"</para>
+      </listitem>
+
+      <listitem>
+        <para>"%gn%" -&gt; "Steve"</para>
+      </listitem>
+
+      <listitem>
+        <para>"%gn%(gn)%sn%" -&gt; "Steve Miller" (would be "Miller" if gn is
+        empty)</para>
+      </listitem>
+
+      <listitem>
+        <para>"§memberUid|, §" -&gt; "user1, user2"</para>
+      </listitem>
+    </itemizedlist>
+
     <para id="customFields_validation_expressions_admin"><emphasis
     role="bold">Validation expressions:</emphasis></para>
 
diff --git a/lam/tests/lib/modules/customFieldsTest.php b/lam/tests/lib/modules/customFieldsTest.php
new file mode 100644
index 00000000..e02cc326
--- /dev/null
+++ b/lam/tests/lib/modules/customFieldsTest.php
@@ -0,0 +1,243 @@
+<?php
+/*
+ This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
+ Copyright (C) 2017  Roland Gruber
+ */
+
+if (is_readable('lam/lib/modules/customFields.inc')) {
+
+	include_once 'lam/lib/baseModule.inc';
+	include_once 'lam/lib/modules.inc';
+	include_once 'lam/lib/modules/customFields.inc';
+
+	/**
+	 * Checks the ppolicy expire job.
+	 *
+	 * @author Roland Gruber
+	 *
+	 */
+	class customFieldsConstantEntryTest extends PHPUnit_Framework_TestCase {
+
+		public function testReplaceWildcardsSpaces() {
+			$originalMiddle = '123((uid))456';
+			$originalStart = '((Uid))456';
+			$originalEnd = '123((uid))';
+			$originalMultiple = '123((uid))456((uid))789';
+			$attributesSet = array('uid' => array('111'));
+			$attributesNotSet = array('uid' => array(''));
+			$attributesNotSet2 = array();
+
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMiddle));
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMiddle));
+			$this->assertEquals('123 456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMiddle));
+
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalStart));
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalStart));
+			$this->assertEquals(' 456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalStart));
+
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalEnd));
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalEnd));
+			$this->assertEquals('123 ', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalEnd));
+
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMultiple));
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMultiple));
+			$this->assertEquals('123 456 789', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMultiple));
+		}
+
+		public function testReplaceWildcardsAttribute() {
+			$originalMiddle = '123%uid%456';
+			$originalStart = '%Uid%456';
+			$originalEnd = '123%uid%';
+			$originalMultiple = '123%uid%456%uid%789';
+			$attributesSet = array('uid' => array('111'));
+			$attributesNotSet = array('uid' => array(''));
+			$attributesNotSet2 = array();
+
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMiddle));
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMiddle));
+			$this->assertEquals('123111456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMiddle));
+
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalStart));
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalStart));
+			$this->assertEquals('111456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalStart));
+
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalEnd));
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalEnd));
+			$this->assertEquals('123111', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalEnd));
+
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMultiple));
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMultiple));
+			$this->assertEquals('123111456111789', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMultiple));
+		}
+
+		public function testReplaceWildcardsAttributeFirst() {
+			$originalMiddle = '123@uid@456';
+			$originalStart = '@Uid@456';
+			$originalEnd = '123@uid@';
+			$originalMultiple = '123@uid@456@uid@789';
+			$attributesSet = array('uid' => array('aBc'));
+			$attributesNotSet = array('uid' => array(''));
+			$attributesNotSet2 = array();
+
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMiddle));
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMiddle));
+			$this->assertEquals('123a456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMiddle));
+
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalStart));
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalStart));
+			$this->assertEquals('a456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalStart));
+
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalEnd));
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalEnd));
+			$this->assertEquals('123a', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalEnd));
+
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMultiple));
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMultiple));
+			$this->assertEquals('123a456a789', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMultiple));
+		}
+
+		public function testReplaceWildcardsAttributeFirstLower() {
+			$originalMiddle = '123?uid?456';
+			$originalStart = '?Uid?456';
+			$originalEnd = '123?uid?';
+			$originalMultiple = '123?uid?456?uid?789';
+			$attributesSet = array('uid' => array('Abc'));
+			$attributesNotSet = array('uid' => array(''));
+			$attributesNotSet2 = array();
+
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMiddle));
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMiddle));
+			$this->assertEquals('123a456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMiddle));
+
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalStart));
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalStart));
+			$this->assertEquals('a456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalStart));
+
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalEnd));
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalEnd));
+			$this->assertEquals('123a', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalEnd));
+
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMultiple));
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMultiple));
+			$this->assertEquals('123a456a789', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMultiple));
+		}
+
+		public function testReplaceWildcardsAttributeFirstUpper() {
+			$originalMiddle = '123!uid!456';
+			$originalStart = '!Uid!456';
+			$originalEnd = '123!uid!';
+			$originalMultiple = '123!uid!456!uid!789';
+			$attributesSet = array('uid' => array('abc'));
+			$attributesNotSet = array('uid' => array(''));
+			$attributesNotSet2 = array();
+
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMiddle));
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMiddle));
+			$this->assertEquals('123A456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMiddle));
+
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalStart));
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalStart));
+			$this->assertEquals('A456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalStart));
+
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalEnd));
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalEnd));
+			$this->assertEquals('123A', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalEnd));
+
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMultiple));
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMultiple));
+			$this->assertEquals('123A456A789', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMultiple));
+		}
+
+		public function testReplaceWildcardsAttributeLower() {
+			$originalMiddle = '123??uid??456';
+			$originalStart = '??Uid??456';
+			$originalEnd = '123??uid??';
+			$originalMultiple = '123??uid??456??uid??789';
+			$attributesSet = array('uid' => array('Abc'));
+			$attributesNotSet = array('uid' => array(''));
+			$attributesNotSet2 = array();
+
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMiddle));
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMiddle));
+			$this->assertEquals('123abc456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMiddle));
+
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalStart));
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalStart));
+			$this->assertEquals('abc456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalStart));
+
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalEnd));
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalEnd));
+			$this->assertEquals('123abc', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalEnd));
+
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMultiple));
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMultiple));
+			$this->assertEquals('123abc456abc789', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMultiple));
+		}
+
+		public function testReplaceWildcardsAttributeUpper() {
+			$originalMiddle = '123!!uid!!456';
+			$originalStart = '!!Uid!!456';
+			$originalEnd = '123!!uid!!';
+			$originalMultiple = '123!!uid!!456!!uid!!789';
+			$attributesSet = array('uid' => array('abc'));
+			$attributesNotSet = array('uid' => array(''));
+			$attributesNotSet2 = array();
+
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMiddle));
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMiddle));
+			$this->assertEquals('123ABC456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMiddle));
+
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalStart));
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalStart));
+			$this->assertEquals('ABC456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalStart));
+
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalEnd));
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalEnd));
+			$this->assertEquals('123ABC', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalEnd));
+
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMultiple));
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMultiple));
+			$this->assertEquals('123ABC456ABC789', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMultiple));
+		}
+
+		public function testReplaceWildcardsAttributeMulti() {
+			$originalMiddle = '123§memberUid|, §456';
+			$originalStart = '§MemberUid|, §456';
+			$originalEnd = '123§memberUid|, §';
+			$originalMultiple = '123§memberUid|, §456§memberUid|;§789';
+			$attributesSet = array('memberUid' => array('abc', 'cde'));
+			$attributesNotSet = array('memberUid' => array(''));
+			$attributesNotSet2 = array();
+
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMiddle));
+			$this->assertEquals('123456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMiddle));
+			$this->assertEquals('123abc, cde456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMiddle));
+
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalStart));
+			$this->assertEquals('456', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalStart));
+			$this->assertEquals('abc, cde456', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalStart));
+
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalEnd));
+			$this->assertEquals('123', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalEnd));
+			$this->assertEquals('123abc, cde', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalEnd));
+
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet, $originalMultiple));
+			$this->assertEquals('123456789', customFieldsConstantEntry::replaceWildcards($attributesNotSet2, $originalMultiple));
+			$this->assertEquals('123abc, cde456abc;cde789', customFieldsConstantEntry::replaceWildcards($attributesSet, $originalMultiple));
+		}
+
+		public function testReplaceWildcardsMixed() {
+			$attributes = array(
+				'uid' => array('myuser'),
+				'street' => array('some street'),
+				'memberUid' => array('abc', 'cde')
+			);
+
+			$this->assertEquals('myuser SOME STREET S abc- cde', customFieldsConstantEntry::replaceWildcards($attributes, '%uid% !!street!! !street! §memberuid|- §'));
+		}
+
+	}
+
+}
+
+?>
\ No newline at end of file