Create Tax Category to maintain GSTIN in Business Partner for India Supplier
1. Go to T. Code - SM30
2. Type - "V_TFKTAXNUMTYPE" in the Table/View and Click on Edit Button
And then Click on "New Entries" and maintain the details
Now go to T. Code - BP and enter the Supplier Code for which you want to maintain the GSTIN Number.
Enter the Business Partner, for which you want to maintain the GSTIN
Below in the Tax Number, enter Tax Category - IN3 and in field Tax Number Long, maintain GSTIN number for Supplier