Released Production Order Pick

Hello, Have a released production order when I select Create Pick it reports Nothing to Process have debugged the code and this is because the Planning Level Code is greater than 0. I have a similar item also with subassemblies that shows the component lines as expected with a Planning Level Code of 0 thus the pick is created. What do I need to do in order to set the Planning Level Code to 0 for components. Is this a setup issue and if so what is causing this behaviour.

Thank you

A