Invalid action on workflow task or user does not have privilege to perform this action.

<bpelFault>          <faultType>1</faultType>          <operationErroredFault xmlns="http://xmlns.oracle.com/bpel/workflow/taskService">             <part name="payload">                <operationErroredFault>                   <faultInfo>exception.code:30036 exception.type: ERROR exception.severity: 2 exception.name: Invalid action on workflow task or user does not have privilege to perform this action. exception.description: Action ACQUIRE on task 22423c56-1b08-43de-9d4e-dc8fa981ca16 cannot be performed by weblogic. exception.fix: Make sure that the action is valid with respect to the current state of the task or ensure that the user has privilege to perform this action on the workflow task. </faultInfo>                </operationErroredFault>             </part>          </operationErroredFault>       </bpelFault>

Please follow below steps to resolve the issue :

1. Stop the SOA Managed Sever
2. Delete the files in the following directories:
1. $DOMAIN_HOME/servers/<soaserver>/cache
2. $DOMAIN_HOME/servers/<soaserver>/data
3. $DOMAIN_HOME/servers/<soaserver>/tmp
3. Clean all the log files.
4. Restart the Managed Server.

In a clustered environment then perform all of the above steps on each node of the cluster.

Then restart the rest of the domain.