Requirement is to get the same accounting combination for all variances in Purchasing and invoicing

Summary:

We have a requirement where Exchange rate variance event and invoice price variance event should have the same accounting combination in both Receipt accounting and Accounting in invoice.

Also, requirement is to default the accounting rule based on inventory organization and user item type.

Since we don't have the sources of inventory organization and item type in the accounting rules of payables subledger, can anyone suggest us how to achieve this requirement?

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