Partner name & address not from Master record

Hi all,

At our client site we are facing an issue where the name and address field in the partners tab is not the one from the KNA1 master record for that customer master number. For instance the ship to party has a number 12345 but the name and address fields in the partner tab are being pulled from a dummy customer 10000 instead. The VBPA table has the ADRNR of the dummy customer (10000) for the ship to party instead of that of the original (12345) customer

Has anyone faced such an issue before or any guidelines where to look at?

Thanks,
Ravin