Characterstics Values in APO

Hi All

This is with respect to Characterstics Values mismatch in production order and Sales order Characterstics Values.

The sales order Characterstics Values are copied to production order.

Now I see there is a mismatch in Characterstics Values in production order and Sales order.

Some of the production order and Sales order Characterstics Values are matching.But only certain production order there is a mismatch.

Any reason behind such behaviour. to resolve this issue.

Regards

Roshan