Datacom/DB RC 05(001) is issued by Datacom CICS Service Facility and it means that the requested table was not in any User Requirements Table (URT). The reason for this error is usually a SYNONYM problem in the CICS URTs, but it could be a bad table name or a nonexistent table name in the Request Area.
As this return code is not originated by MUF, no PXX dump can be produced for this error, in order to find out the name and DBID of the involved table.
If you do not know which URT is involved, do the following to isolate and determine the problem, if it is reproducible: