diff --git a/modules/activiti-cactus/pom.xml b/modules/activiti-cactus/pom.xml
index 0f1d8608415efffefade87c6052d8ba7d7687d1c..b5a669ed4656eb55e7561537355fe596618b80be 100644
--- a/modules/activiti-cactus/pom.xml
+++ b/modules/activiti-cactus/pom.xml
@@ -12,7 +12,7 @@
     <groupId>org.activiti</groupId>
     <artifactId>activiti-root</artifactId>
     <relativePath>../..</relativePath>
-    <version>5.9-SNAPSHOT</version>
+    <version>5.10-SNAPSHOT</version>
   </parent>
 
   <dependencies>
diff --git a/modules/activiti-camel/pom.xml b/modules/activiti-camel/pom.xml
index 34e820bd6c7a5e9992bda3881fb1114b9f5bd30a..fb2f83d51c2d3043a4955668de4d7870005d9e19 100644
--- a/modules/activiti-camel/pom.xml
+++ b/modules/activiti-camel/pom.xml
@@ -12,7 +12,7 @@
 		<groupId>org.activiti</groupId>
 		<artifactId>activiti-root</artifactId>
 		<relativePath>../..</relativePath>
-        <version>5.9-SNAPSHOT</version>
+        <version>5.10-SNAPSHOT</version>
 	</parent>
 
 
diff --git a/modules/activiti-cdi/pom.xml b/modules/activiti-cdi/pom.xml
index 4eccbc75da56e46ea709dc0ca0ee518ec1730066..ae29e5640d583d6e3bea525e36ab0de412efc8e4 100644
--- a/modules/activiti-cdi/pom.xml
+++ b/modules/activiti-cdi/pom.xml
@@ -12,7 +12,7 @@
 		<groupId>org.activiti</groupId>
 		<artifactId>activiti-root</artifactId>
 		<relativePath>../..</relativePath>
-		<version>5.9-SNAPSHOT</version>
+		<version>5.10-SNAPSHOT</version>
 	</parent>
 
 	<dependencies>
diff --git a/modules/activiti-cxf/pom.xml b/modules/activiti-cxf/pom.xml
index b1b72ff6d5a23e5d9b1d7bbc4dd0f11a837f61f7..cc82ff7f4a3ea020e431aa4ad6750969c3769817 100644
--- a/modules/activiti-cxf/pom.xml
+++ b/modules/activiti-cxf/pom.xml
@@ -11,7 +11,7 @@
 		<groupId>org.activiti</groupId>
 		<artifactId>activiti-root</artifactId>
 		<relativePath>../..</relativePath>
-		<version>5.9-SNAPSHOT</version>
+		<version>5.10-SNAPSHOT</version>
 
 	</parent>
 
diff --git a/modules/activiti-engine/pom.xml b/modules/activiti-engine/pom.xml
index 79cdb0ad6e6a28461ec12898667371e45ea3efbc..0d1752fd065d62cf2855b56080ea63eb7d15413d 100644
--- a/modules/activiti-engine/pom.xml
+++ b/modules/activiti-engine/pom.xml
@@ -11,7 +11,7 @@
     <groupId>org.activiti</groupId>
     <artifactId>activiti-root</artifactId>
     <relativePath>../..</relativePath>
-    <version>5.9-SNAPSHOT</version>
+    <version>5.10-SNAPSHOT</version>
   </parent>
 
   <dependencies>
diff --git a/modules/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/behavior/CallActivityBehavior.java b/modules/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/behavior/CallActivityBehavior.java
index 10f33f23b9d5790822aa4878d1051e829afc9622..57693b77db92cea2efbde01eabb3550552921ea1 100644
--- a/modules/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/behavior/CallActivityBehavior.java
+++ b/modules/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/behavior/CallActivityBehavior.java
@@ -58,7 +58,7 @@ public class CallActivityBehavior extends AbstractBpmnActivityBehavior implement
 
   public void execute(ActivityExecution execution) throws Exception {
     
-    if ((processDefinitonKey == null) && (processDefinitionExpression != null)) {
+    if (processDefinitionExpression != null) {
       processDefinitonKey = (String) processDefinitionExpression.getValue(execution);
     }
     
diff --git a/modules/activiti-engine/src/test/java/org/activiti/engine/test/bpmn/callactivity/CallActivityAdvancedTest.java b/modules/activiti-engine/src/test/java/org/activiti/engine/test/bpmn/callactivity/CallActivityAdvancedTest.java
index c6599a03c98a4aed391dfb54a72c05c54c569828..0f1a2b0abda897655a2ea08f19d2d927b668809d 100644
--- a/modules/activiti-engine/src/test/java/org/activiti/engine/test/bpmn/callactivity/CallActivityAdvancedTest.java
+++ b/modules/activiti-engine/src/test/java/org/activiti/engine/test/bpmn/callactivity/CallActivityAdvancedTest.java
@@ -138,6 +138,65 @@ public class CallActivityAdvancedTest extends PluggableActivitiTestCase {
     taskService.complete(taskB.getId());
     assertEquals(0, runtimeService.createExecutionQuery().count());
   }
+
+  @Deployment(resources = { "org/activiti/engine/test/bpmn/callactivity/CallActivity.testCallSequentialSubProcess.bpmn20.xml",
+		  "org/activiti/engine/test/bpmn/callactivity/CallActivity.testCallSimpleSubProcessWithExpressions.bpmn20.xml",
+		  "org/activiti/engine/test/bpmn/callactivity/simpleSubProcess.bpmn20.xml",
+  	      "org/activiti/engine/test/bpmn/callactivity/simpleSubProcess2.bpmn20.xml"})
+  public void testCallSequentialSubProcessWithExpressions() {
+
+	    ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("callSequentialSubProcess");
+
+	    // FIRST sub process calls simpleSubProcess
+	    
+	    // one task in the subprocess should be active after starting the process
+	    // instance
+	    TaskQuery taskQuery = taskService.createTaskQuery();
+	    Task taskBeforeSubProcess = taskQuery.singleResult();
+	    assertEquals("Task before subprocess", taskBeforeSubProcess.getName());
+
+	    // Completing the task continues the process which leads to calling the
+	    // subprocess. The sub process we want to call is passed in as a variable
+	    // into this task
+	    taskService.setVariable(taskBeforeSubProcess.getId(), "simpleSubProcessExpression", "simpleSubProcess");
+	    taskService.complete(taskBeforeSubProcess.getId());
+	    Task taskInSubProcess = taskQuery.singleResult();
+	    assertEquals("Task in subprocess", taskInSubProcess.getName());
+
+	    // Completing the task in the subprocess, finishes the subprocess
+	    taskService.complete(taskInSubProcess.getId());
+	    Task taskAfterSubProcess = taskQuery.singleResult();
+	    assertEquals("Task after subprocess", taskAfterSubProcess.getName());
+
+	    // Completing this task end the process instance
+	    taskService.complete(taskAfterSubProcess.getId());
+	    
+	    
+	    // SECOND sub process calls simpleSubProcess2
+	    
+	    // one task in the subprocess should be active after starting the process
+	    // instance
+	    taskQuery = taskService.createTaskQuery();
+	    taskBeforeSubProcess = taskQuery.singleResult();
+	    assertEquals("Task before subprocess", taskBeforeSubProcess.getName());
+
+	    // Completing the task continues the process which leads to calling the
+	    // subprocess. The sub process we want to call is passed in as a variable
+	    // into this task
+	    taskService.setVariable(taskBeforeSubProcess.getId(), "simpleSubProcessExpression", "simpleSubProcess2");
+	    taskService.complete(taskBeforeSubProcess.getId());
+	    taskInSubProcess = taskQuery.singleResult();
+	    assertEquals("Task in subprocess 2", taskInSubProcess.getName());
+
+	    // Completing the task in the subprocess, finishes the subprocess
+	    taskService.complete(taskInSubProcess.getId());
+	    taskAfterSubProcess = taskQuery.singleResult();
+	    assertEquals("Task after subprocess", taskAfterSubProcess.getName());
+
+	    // Completing this task end the process instance
+	    taskService.complete(taskAfterSubProcess.getId());
+	    assertProcessEnded(processInstance.getId());
+  }
   
   @Deployment(resources = {
     "org/activiti/engine/test/bpmn/callactivity/CallActivity.testTimerOnCallActivity.bpmn20.xml",
diff --git a/modules/activiti-engine/src/test/resources/org/activiti/engine/test/bpmn/callactivity/CallActivity.testCallSequentialSubProcess.bpmn20.xml b/modules/activiti-engine/src/test/resources/org/activiti/engine/test/bpmn/callactivity/CallActivity.testCallSequentialSubProcess.bpmn20.xml
new file mode 100644
index 0000000000000000000000000000000000000000..aa87ff69b0cf07d00a6ab2f8cc80cb7a2c7534ef
--- /dev/null
+++ b/modules/activiti-engine/src/test/resources/org/activiti/engine/test/bpmn/callactivity/CallActivity.testCallSequentialSubProcess.bpmn20.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions id="definitions" 
+  xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
+  xmlns:activiti="http://activiti.org/bpmn"
+  targetNamespace="Examples">
+  
+  <process id="callSequentialSubProcess">
+  
+    <startEvent id="theStart" />
+    
+    <sequenceFlow id="flow1" sourceRef="theStart" targetRef="callSubProcess" />
+    
+    <callActivity id="callSubProcess" name="" calledElement="callSimpleSubProcess">
+      <multiInstanceLoopCharacteristics isSequential="true">
+        <loopCardinality>2</loopCardinality>
+      </multiInstanceLoopCharacteristics>
+    </callActivity>
+    
+    <sequenceFlow id="flow3" sourceRef="callSubProcess" targetRef="theEnd" />
+    
+    <endEvent id="theEnd" />
+    
+  </process>
+
+</definitions>
diff --git a/modules/activiti-engine/src/test/resources/org/activiti/engine/test/bpmn/callactivity/simpleSubProcess2.bpmn20.xml b/modules/activiti-engine/src/test/resources/org/activiti/engine/test/bpmn/callactivity/simpleSubProcess2.bpmn20.xml
new file mode 100644
index 0000000000000000000000000000000000000000..fcff7af6b1a8483932f44b7119e8ec5f415ec8ff
--- /dev/null
+++ b/modules/activiti-engine/src/test/resources/org/activiti/engine/test/bpmn/callactivity/simpleSubProcess2.bpmn20.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions id="definitions" 
+  xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
+  xmlns:activiti="http://activiti.org/bpmn"
+  targetNamespace="Examples">
+  
+  <process id="simpleSubProcess2">
+  
+    <startEvent id="theStart" />
+    
+    <sequenceFlow id="flow1" sourceRef="theStart" targetRef="task" />
+  
+    <userTask id="task" name="Task in subprocess 2" />
+    
+    <sequenceFlow id="flow2" sourceRef="task" targetRef="theEnd" />
+    
+    <endEvent id="theEnd" />
+    
+  </process>
+
+</definitions>
\ No newline at end of file
diff --git a/modules/activiti-mule/pom.xml b/modules/activiti-mule/pom.xml
index 24dbde236db23360f90dd23831f94aa8b669ef1d..6483944db6a89e094d2b74511198a972b2bdecc2 100644
--- a/modules/activiti-mule/pom.xml
+++ b/modules/activiti-mule/pom.xml
@@ -11,7 +11,7 @@
 		<groupId>org.activiti</groupId>
 		<artifactId>activiti-root</artifactId>
 		<relativePath>../..</relativePath>
-		<version>5.9-SNAPSHOT</version>
+		<version>5.10-SNAPSHOT</version>
 
 	</parent>
 
diff --git a/modules/activiti-osgi/pom.xml b/modules/activiti-osgi/pom.xml
index 2067a26285f944a5291ea60a9521d0f6b1381863..9f23534b3a4ec9998a29c6afe0d9d30553d4b9f9 100644
--- a/modules/activiti-osgi/pom.xml
+++ b/modules/activiti-osgi/pom.xml
@@ -12,7 +12,7 @@
 		<groupId>org.activiti</groupId>
 		<artifactId>activiti-root</artifactId>
 		<relativePath>../..</relativePath>
-        <version>5.9-SNAPSHOT</version>
+        <version>5.10-SNAPSHOT</version>
 	</parent>
 
 	<build>
diff --git a/modules/activiti-spring/pom.xml b/modules/activiti-spring/pom.xml
index e6c93dec30f0801818c733936c05695534461b26..0f0b342a992b9c18a3d34236aca1f744114ee602 100644
--- a/modules/activiti-spring/pom.xml
+++ b/modules/activiti-spring/pom.xml
@@ -10,7 +10,7 @@
 		<groupId>org.activiti</groupId>
 		<artifactId>activiti-root</artifactId>
 		<relativePath>../..</relativePath>
-		<version>5.9-SNAPSHOT</version>
+		<version>5.10-SNAPSHOT</version>
 	</parent>
 
 	<dependencies>
diff --git a/modules/activiti-upgrade/pom.xml b/modules/activiti-upgrade/pom.xml
index af07951b696c33633a8d81f0a152e093360aa47e..ec3bca1ef9a1972b83959d9bdf4c7d24a57f685f 100644
--- a/modules/activiti-upgrade/pom.xml
+++ b/modules/activiti-upgrade/pom.xml
@@ -6,7 +6,7 @@
   <name>Activiti - Upgrade</name>
   <groupId>org.activiti</groupId>
   <artifactId>activiti-upgrade</artifactId>
-  <version>5.9-ALWAYS-SNAPSHOT</version>
+  <version>5.10-ALWAYS-SNAPSHOT</version>
 
   <properties>
     <skipTests>true</skipTests>
diff --git a/modules/activiti-webapp-explorer2/pom.xml b/modules/activiti-webapp-explorer2/pom.xml
index 7f54a1a19d1cab1dc2fd4a775b6eb9e396e63fd4..e46e3904cc353b79ce9df7dd66fe37f67fb91446 100644
--- a/modules/activiti-webapp-explorer2/pom.xml
+++ b/modules/activiti-webapp-explorer2/pom.xml
@@ -12,7 +12,7 @@
     <groupId>org.activiti</groupId>
     <artifactId>activiti-root</artifactId>
     <relativePath>../..</relativePath>
-    <version>5.9-SNAPSHOT</version>
+    <version>5.10-SNAPSHOT</version>
   </parent>
 
   <properties>
diff --git a/modules/activiti-webapp-rest2/pom.xml b/modules/activiti-webapp-rest2/pom.xml
index 3149d200e2411401f2635c0dd2cc8adf92a71884..e4657ac00a31d75ec5086e21b87a41a746bbc564 100644
--- a/modules/activiti-webapp-rest2/pom.xml
+++ b/modules/activiti-webapp-rest2/pom.xml
@@ -10,7 +10,7 @@
     <groupId>org.activiti</groupId>
     <artifactId>activiti-root</artifactId>
     <relativePath>../..</relativePath>
-    <version>5.9-SNAPSHOT</version>
+    <version>5.10-SNAPSHOT</version>
   </parent>
 
 	<build>
diff --git a/pom.xml b/pom.xml
index 530764f8859486e6e9fdb56012dff40740bbc8c1..0c90dc26e56332ff4714980e21c3949b707da680 100644
--- a/pom.xml
+++ b/pom.xml
@@ -8,7 +8,7 @@
   <artifactId>activiti-root</artifactId>
 
   <packaging>pom</packaging>
-  <version>5.9-SNAPSHOT</version>
+  <version>5.10-SNAPSHOT</version>
   <properties>
     <spring.framework.version>3.0.3.RELEASE</spring.framework.version>
     <mule.version>3.1.0</mule.version>