When the OrigClOrdID is required?

Imported from previous forum

The FIX specification says, that in the Execution Report message the OrigClOrdID is "Conditionally required for response to an electronic Cancel or Cancel/Replace request (ExecType=PendingCancel, Replaced, or Canceled)". What about ExecType=PendingReplace? This is also a response to an electronic Cancel/Replace request.

Thanks for any help,
Greg