Timecard Approval for Multiple Assignments

We are a UK local authority and have employees who have multiple jobs within the council or its wholly owned organisations. These employees have several assignments across these different organisations. At the time of implementation, we set up these employees with the same employee numbers but different assignment numbers in Oracle Fusion. Each of these assignments has different managers to whom the employees report. The issue arises when an employee with multiple assignments submits their timecard - it only goes to their primary manager for approval. This primary manager then has to communicate off-system with the secondary manager to confirm