1880786 - Error Message 'Instance with the same key already exists' While Migrating Supplier

When you try to migrate Supplier, system throws below error message:

'Instance with the same key already exists'

SAP Business ByDesign

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.

You are allowed to maintain Payment Method 2. This is a hidden column. So you need to unhide the column D which is Payment Method 2, where you can enter the other Payment Method for the supplier.

For Example: For Supplier A, Payment Method 1 as Check and Payment Method 2 as Bank Transfer.

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