Solution : https://service.sap.com/sap/support/notes/541293 (SAP Service marketplace login required)
Key words : 
financial services reason, assumed production operation, assigned partner numbers, terms business partner, sap bp number, business partner conversion, attached correction instructions, conversion phase ii, partner number, conversion phase
Related Notes : 
       
| 518307 | BP:Conversion:Processing of BP with deletion flag | 
| 445507 | SAP BP conversion:no locking of partner with deletion flag | 
| 398888 | BP_TR1: Composite note and FAQs about bus partner conversion |