BOM in Picking ( delivery)

Hi, Experts,

i have 3 questions related to the topic.

1. I can only pick BOM header material in delivery, and all item material is marked grey, not maintainable. Could any one tell me how / where this is configured ?

2. how to check a material in bom is stock relevant or not / even more basic -

3. how to tell generally whether a material is stock relevant regardless BOM or not in BOM ? whether the plant view is maintained in MM01 ?

Thanks!

Recke