Unaccepted service entry sheets exist: item cannot be deleted, Im facing this error while putting deletion mark for service PO

Dear Users,

We are facing an issue while deleting service PO like 'Unaccepted service entry sheets exist: item cannot be deleted'. And if I accept the service entry sheet then GRN is happening but i dont want GRN to happen so Im clicking on revoke button for reversal and then trying to delete the PO, but system is showing above error. Please suggest if there is any configurations need to be done.

Thanks,

Kumar