OPE MODIF : lack of error message on duplicate patriarche number
Patriarche reference is unique, so we could not record 2 OPE with the same Patriarche number (integer).
On modif OPE if we add an already used PATRIARCHE number, Ishtar doesn't add that, but not error message is displayed. We should have one.
This have been reported on ISHTAR-PROD