The requirement is imprecise. It is not clear whether they mean to limit it to CSR's related to PPAPs, or CSR's related to the customer in general. I believe if you think about the intent of the PPAP exercise in the first place, it is to demonstrate that in making this particular part number, you will be able to meet all the relevant requirements (dimensional, product performance, material properties, capabilty and stability of your processes...etc,). Therefore, it stands to reason, if the customer has a relevant CSR, it would be approrpiate to make mention of it, or demonstrate the requirement is met. That is how I look at it when doing audits. It is a somewhat broader interpretation, but clearly would meet the customer's needs, which is what a PPAP is all about.