Customer Material received

Dear Gurus,

I have the following customer material scenario and required soloution.

Some time customer send its bottles(empty) for the refilling.

So i have created a sales order of customer of packaging received, and in material master i mark "KP" no check, and movement type i use 654, but when i am on delivery document and press post goods receipt system give me the following message related to stock "Deficit of SL Unrestricted-use 1 EA : 23000002 1000 1001".

Its true that i dont have any customer stock before this, than how could i receive this material to a specific storage location.

Pls advise.

Regards,