Profit Center Substitution in Sales order

Hello All,

I have a Small Issue here.

we have a substitution rule for the PCA Derivation in the SO with the combinations of few Sales Org, Distribution Channels and Divisions.

But when a WBS Element is Assigned in the Sales order it is over writting the Substitued profit center with the profit center in the WBS Element.

If we have not maintained any thing in the WBS it is Deriving the Dummy Profit Center from the controlling Area Settings in PCA

Best Regards

Ravi