partner CA not copied into inbound delivery

Hi

I have been checking lot of posts in the community and not sure if we had a clear solution for this.

I am having partner functions VN and CA to my vendor. I have maintained these as mandatory in the partner determination for PO and Inbound delivery (EL).

The same partner is also there for Sales Orders partner determination.

These are copied into the PO but when a inbound delivery is created it copied the CA but with a 0 value or no value.

Any idea?

is the solution only by a USX as mentioned in some of the posts.

Cant we solve this by some config changes? 

thanks

SAP USER