Hi Corinne,
Obtain the Product GUID from table /SAPSLL/PNTPR, then use that to search the entries in table /SAPSLL/PRCTS for your Product. Do you find two entries for the 'Commercial Control List' Numbering Scheme? If so, what differences can you see - only GUID_PRCTS and GUID_CTSNUM, or also other field values?
I can't reproduce the effect you're seeing, so need more information.
Thanks & regards,
Dave