How to determine the correct intermediary bank account if 1 supplier bank account has multiple acc?

Summary:

In a scenario where one supplier has one bank account, but multiple intermediary accounts attached to the same account, how to determine the correct intermediary bank account when making payment? Not both the intermediary accounts related to same payment i.e., one intermediary should be used when payment is against 1 BU, and the other one is for other BU.

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