Changing Company code at the line item of the shopping cart (Urgent)

Hello,

I am facing one production issue. I have all the catalogs listed. I choose one product from the catalog and get the items back into my shopping cart. Now in the shopping cart item i want to change company code (The comapny codes are assigned in my Attributes). I am getting the comapny code selection list but when i choose other than the default company code, it resets back it to the default comapny code. I am unable to change the company code at item level in the shopping cart.

I am using SRM_SERVER 5.5.

Please suggest solution for this.

Thanks in anticipation.

Sarabjeet