How oracle dynamically select correct user BU expense account when user has 2 Legal Entities

Summary:

We have to create POs in a new ledger (new COA setup). Previous COA was 10 segments and new COA is 8 segments. The Purchasing Charge Account Rules defaults the Default Expense Account from the employee assignment. For the users to be able to create POs in the new ledger, we are creating a new Work Relationship for the employee to be able to put the new Default Expense Account (8 segments). We did two scenarios, namely:

Scenario 1: Create a second work relationship for an employee with new Legal Entity (New COA) – Work Relationship Primary Flag = No

Scenario 2: Create a second work relationship for an employee with new Legal Entity (New COA) – Work Relationship Primary Flag = Yes