Change a Material Code ( movement type 309 ) without a FI document

Hi everyone,

I want to move my material ( manages with a serial number ) from a storage location to another and also to change my  material code WITHOUT create a FI document.

Example:     FROM      SLocation 555       Material Code 999     Qty 1

                    TO            SLocation 777       Material Code 111     Qty 1

I use the movement type 309 but the system asks me an account for an FI document.  I don't want to post an FI document because my materials has only a  quantity evaluation.

How can I do to solve my problem?

Thanks.

Patrizia