Error while making UD for AFS material

Hi all,

While returning quantity to vendor at the time of making usage decision for AFS material via QA11 transaction I am getting an error message "Entry 4500000226 00010 0000 not valid; correct entry Message no. 8J182". Whereas when the quantity is returned to vendor for non AFS material via QA11 transaction I am not getting any error message. Can anyone tell me why I am getting error message only AFS material. Thanking everyone in advance for feedback's and suggestions.

Regards

V. Srinivasa Ranganath