Unable to Delete combinations

Hi

I am trying to delete combinations which are not valid in Demantra and also it doesn't has history for the same. Its giving me below error message.

Error in running workflow schema:'Remove Combinations'

Program Internal error: ODPM -70422: Remove Combinations process failed.

(Enclosed the screenshot)

I also check in database:

SELECT * FROM DM.INTEG_STATUS

WHERE PROCESS LIKE 'Remove Combinations'

ORDER BY STATUS_DATE DESC ;

which doesn't have any error message either.

Can  you help us in resolving this critical issue.

Thank you,

Venkatesh