Allowing an employee to add payment to other employees invoices, but only that. Also a setting where an employee can only have full control over invoices that they initiate -- for example, if Employee 1 starts an invoice, they can add to it as necessary and have full control, but they can only 'add payment' to another employees invoice. As well as only manager being able to change employee name on an invoice (for example if employee 1 initiates an invoice but receives payment for employee 2's invoice, they can't change it to be their invoice, they can add their name, but can't subtract anything). Just in general, all employees should be able to add to invoice, but only the initiating employee should be able to subtract thereby creating a scenario where an employee can't edit the amount in another persons invoice.