Hi Venkat,
Check:
Customizing with tx TRLCCHK .
TRM posting to alternative reconciliation account of customer subldeger
TBB1: using vendor subledger for postings in TRM. | SCN
as a basis on how to configure for customer posting. You should check Posting Symbol 2 for customer.
In TBB1, if you "Post to Operative only" or "All valuation area" , is the same result ?
Kind Regards