operation status check in co11n

Hello all,

my customer uses external operations. He wants to be sure that external operation cannot be confirmed if GR for external operation has not already posted.

I know that goods receipt of an externally processed material causes the status of the operation to be updated so I've thought to check in CO11N operation status: if is not "delivered", then do not save the confirmation. I'm not sure this can be done using sap enhancement CONFPP03: Customer-defined checks after operation selection.

Is there any suggestion?

Is there any other way?

Regards

Nue