Zero 07 Cost at receiving Plant

We are rolling out our Distribution centers onto JDE (9.1) and have some issues with Receipt Routing. In the middle of our project we classified some of our MFG items out of our Plant as a Zero Cost item. The receiving plant now has a Zero 07 cost. These items are shipped out to our end customers from these locations.

Due to this change anything shipped from our Plant to this Distribution center does not go into receipt routing.

I was able to update this cost to 1.00 and it fixed the issue. Based on my discussion with a former colleague JDE is trying to write a variance and stopping the receipt routing record. Has anyone else experienced this or have any recommendations on how to resolve this?

thanks... TG