India GST Implementation

Hi,

I am working on GST India Implementation. I am using Non stock items with Line type 'N', stocking type 'S'. Inv Interface of line type 'N' is 'A' because user wants to change the Description on Purchase Order. My Purchase order is with account number entered on the line.

I have created LCR in P75I791 with IGST /CGST/SGST directing to different GL class codeS and expected to hit different account than the account entered on the PO against item. But during LCR application at the standalone landed cost, it is not fetching the account set in DMAAI 4385 or 4315 but it is always Credit to Account on PO and debit to RNV, why?