How to restrict users from entering a credit memo against a project invoice in AR

Hi Experts,

We had a situation where a business user had credited a project invoice in AR. For the same project invoice, another credit memo (canceling invoice) has been generated from Projects resulting in overapplication.

We would like to know if there is anyway we can restrict business users from entering a credit memo against a project invoice in AR.

Please share your valuable inputs in this regard and assist.

Thanks.