Excluding Employee Expense Report Invoice from Payment Process Request in Oracle Fusion

Summary:

Description:
We need guidance on how to exclude Employee Expense Report invoices from a Payment Process Request (PPR) in Oracle Fusion. Currently, these invoices are being picked up alongside supplier payments, and we want to understand the correct configuration to prevent this from happening.
Example:

• Invoice A – Payment Request Source: Expenses

• Invoice B – Source: Expenses

• Invoice C – Source: Procurement

Invoice D – Source: Manual
The expectation is that PPR should only select supplier payments, while expense-related invoices should be excluded.
Could you provide recommendations on how to configure the system to ensure expense invoices are ignored in the payment process? Any best practices for defining selection criteria would be greatly appreciated.