Oracle Error Message
ORA-37138: (XSCCOMP13) You cannot delete values from workspace object because it is an aggregated COMPRESSED COMPOSITE.
Reason for the Error
The user tried to MAINTAIN DELETE from an aggregated COMPRESSED COMPOSITE.
Solution
In order to perform this sort of maintenance the composite must first be cleared. This can be done by running the CLEAR AGGREGATES command on the variable dimensioning the composite. Note that this will remove all data computed during the last AGGREGATE command.