You can clean up Treasury Business Partner data to improve the quality of the business partner conversion.
In the standard system, the customer master record assignments to the Treasury Business Partner are transferred to the SAP Business Partner.
If you no longer want to use customer integration in the SAP Business Partner, you could write your own program to delete the Customer Number 1 field in table BP000 (Business Partner Master (General Data)) for the Treasury Business Partner, before you carry out the business partner conversion. This program would delete the link between the customer master record and the business partner, and the system could generate the SAP Business Partner without customer integration.
Note that you should only delete this link if you are sure that there are no more postings linked to the business partner. Deleting this link could result in data inconsistency if you do not check your data thoroughly beforehand. For this reason, SAP cannot assume any responsibility for the deletion.
For further information about customer integration, see Master Data Synchronization and Customer/Vendor Integration.