How to hardcode Expense-to-Expense Inter-Org Transaction Account so both lines use the default code?

Summary: We have a client requirement for which they need to perform Expense to Expense Inter-Org transactions and they need both Expense Lines in Cost Accounting to show a hard coded default code.

Content (please ensure you mask any confidential information): Our client requires Expense-to-Expense Inter-Org transactions, where both Expense Lines in Cost Accounting must automatically reflect a hardcoded default code for consistency and accurate financial reporting. Could you assist in identifying the correct rules and conditions to ensure these default combinations are properly applied?

We have already modified the rules so that Inter-Org Asset-to-Expense transactions use the Project account combination, which should remain unaffected. Please let us know if there is a way to implement this without impacting the existing Asset-to-Expense setup.