How can I manage batck key in process order component?

Hi,

when I create a process order I have a material code that has no value in Batch Key field. So when I release for automatic batch determination, the system doesn't check the batch for that component. Instead, if I select the record and execute batch determination with button, I find the batch.

I've checked the material master data and the component is correctly batch managed.

What should I check?

Thanks