diff --git a/grails-app/services/com/jcatalog/grailsflow/ProcessManagerService.groovy b/grails-app/services/com/jcatalog/grailsflow/ProcessManagerService.groovy
index d67c051..0a52235 100644
--- a/grails-app/services/com/jcatalog/grailsflow/ProcessManagerService.groovy
+++ b/grails-app/services/com/jcatalog/grailsflow/ProcessManagerService.groovy
@@ -244,7 +244,7 @@ class ProcessManagerService implements InitializingBean {
      *
      * @return process ID value if process was started successfully
      */
-    public synchronized def startProcess(def processTypeID, def user, def variables) {
+    public def startProcess(def processTypeID, def user, def variables) {
         // check processTypeID in supportedProcessTypes
         if (!processFactory.getProcessTypes().contains(processTypeID)) {
             log.error("Cannot start process of type '${processTypeID}'. Type is not supported.")
@@ -304,13 +304,13 @@ class ProcessManagerService implements InitializingBean {
 
                 updateProcessAssignees(basicProcess, processAssignees)
 
-                basicProcess.addToNodes(startNode)
+                BasicProcess.withTransaction {status->
+                    basicProcess.addToNodes(startNode)
 
-                if (startNodeDef.forcedStart) {
-                    grailsflowLockService.lockProcessExecution(startNode)
-                }
+                    if (startNodeDef.forcedStart) {
+                        grailsflowLockService.lockProcessExecution(startNode)
+                    }
 
-                BasicProcess.withTransaction {status->
                     if (!basicProcess.save(flush: true) ) {
                         status.setRollbackOnly();
                         log.error("Cannot save process: "+basicProcess.errors)