Changing retroactive GL in SAP Payroll

Dears ,

I am trying to change the GL mapped to the symbolic account 9100 for (/551 , /552, /553) wagetypes , I didn't create a new symbolic account ,I just mapped the existing one (9100) to the new GL in OBYG (based on the recommendation answered in SAP Community) but when I do posting to the finance I see the GL is transferred to the basic salary's GL