Hello Vinicius,

I believe this is the expected behavior indeed: with normal Bill Of Materials, each Bill Of Material is assembled in a new production order. So to produce your top level product, the "level 1" components will be required in some production order.

Then the scheduler will eventually create draft purchase orders or draft production orders to produce the components required in this production order at "level 1". Of course, you also need to properly define what will happen with the level 2 components: are them taken from stock? produced? bought?

Now, you can have OpenERP require all components at once no matter the depth if you use a special kind of Bill Of Material, the "phantom BOM". You can read more about phatom BOM's here: doc.openerp.com/7.0/book/5/5_15_Manufacturing/5_15_Master_data/#phantom-bills-of-materials

Hope this helps