QM active and QI stock not available for MRP planning

When we set a plant/material as active for QM, QI stock is switched to not available for planning when you look at Stock Statistics on MD04. What is the cause of this? For plant/materials that are not QM active it is available for planning. As a result of this planned orders are created until the UD is posted. Is there a configuration setting for this?

Appreciate any help anyone can give.