When creating Production Orders through the PdO Creation Wizard, you might see this message:
Explanation and Fix
This is due to the fact that some of your raw materials (such as grains and hops), packaging items or overhead items are set to have a Process Type when they shouldn't. Process Types are only set for items that go through a process (e.g. Wort, Bright Beer, fermented mash etc.) and not component items.
You will need to go into the Bill of Materials for the item you are trying to create through the PdO Creation Wizard and update those Process Types to 'None' and the error will be fixed: