Wrong Account is being picked after J_1IG_INV inbound invoice in GST STO

Dear SCN's,

I have facing an issue like STO PO is raised from 1100-Plant to Supplying Plant-1200. Now after PGI and Outbound Invoice we are performing GRN. While raising Inbound invoice through transaction J_1IG_INV system is picking wrong Account (Vendor Account) instead of Account number for Plant-1200 it is picking Plant-1300.

Please give some advice on where has been wrong, I have checked the T001W plant assignment to Vendor account and it is correctly assigned.

Regards,

Shyam