Return with MAP while stock deficit

Dear All,

I need to check the behavior of the system in returning material with moving average price resulting in price zero of material while there is stock, and here is a case

For example

Current MAP of material = 5.5

Current stock of this material = 1500

Current balance = 1500 * 5.5 = 8250

Return delivery of this material which its price was 10 at the time of receiving the PO, and the PO quantity = 1000

Hence, the system behaves as follows (accounting entry generated from the return delivery material document)

Dr. GR/IR             10000

Cr. Stock              8250

Cr. Price difference         1750

Which leads the MAP = 0 , and its stock = 500

But it should generates an accounting document as the following

Dr. GR/IR             10000

Cr. Stock              5500

Cr. Price difference         4500

Kindly provide me if its really the standard behavior of the system, and if it is kindly provide an OSS or a link of sap help

Appreciating your quick response

Thanks,