DFS3301W AN INVALID REQUEST WAS MADE TO DELETE A SUBPOOL

Explanation
 An internal request was made to delete a subpool
or extent which had not been quiesced and logically deleted.  This
problem is an internal system error.  

System action
 IMS ignored
the delete request.

Programmer response
Obtain a memory dump of the IMS subsystem, and contact IBM® Software
                Support for
assistance in determining the specific problem.