Query '&' is already open in another session

What causes this issue?

This error can be caused by:
Another open window that contains this worklist query
Previous abnormal program termination

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

To correct this error, you can perform one of the following activities:
Close the other window and reload the worklist.
Log off and log on again.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.