2459083 - Cannot update Account Owner via Data Migration Tool

Error while updating Account Owner via Data Migration Tool:

Please assign party role Employee Responsible – Sales only once

1. Go to Business Configuration work center

2. Select Overview view

3. Search for Migration of Customers.

4. Select Migration Mode: Modify already exisiting records.

5. Update only Account Owner and with entry Party Role XXX(where XXX represents Party Role) .

 Above error is thrown.

The mapping of the Account ID : YYY(where YYY represents Account ID) is maintained as ZZZ (where ZZZ represents Account ID) at Convert Value Step.
This throws error as ZZZ already has an Owner assigned.

If the changes are required in Account ZZZ, then you have to proceed and delete the Owner data for ZZZ and modify via import.
But if you wish to change the Account ID:YYY, you need to map this correctly in the Migration Tool at step Convert Value and proceed further for modifications.
You can also update the Account Direct Responsibility Owner via Mass Data Maintainence.

Account Direct Responsibility Owner, Migration of Customers , KBA , AP-RC-BCT , Business Config. Tools (SAP Business ByDesign , How To