When you try to migrate Supplier, system throws below error message:
Instance with the same key already exists
The cause for the issue could be, in the Payment sheet of the Migration file of Supplier, you might have maintained both Check and Bank Transfer for some of the Suppliers as Payment Method 1.
User is allowed to maintained, Payment Method 2. This is a hided column. So user need to unhide the column D which is Payment Method 2, where you can enter the another Payment Method for the supplier.
For Example: For Supplier A, Payment Method 1 as Check and Payment Method 2 as Bank Transfer.
KBA , payment method , supplier migration , SRD-MD-PRD-PRD , Product , How To