credit memo request w/o reference for expenses

Dear All,

I have a scenario in Legacy system, where Credit is being issued to customers, to reimburse expenses like Admin / Logistics/ self repair cost etc which are incurred during using of Faulty product delivered them as part of previous legacy sales, without the product being returned(product remains at customer site). This is not pricing / invoice correction.

We are in the design phase and looking at providing an SAP solution for this requirement. What would be the best approach in S/4 Hana to issue credit for such customer expenses which was not previously billed to them ?

Can credit memo request w/o reference be used ? with some material type like DIEN / SERV to credit back the expenses ?

Kindly advice based on SAP best practices.