OCA/OCB — pull request #80 by rdeheele (2014-11-04 13:03:21+00:00)
Title: [FIX] MO: change required conditions on bom_id

on mrp.production form view, bom_id field may be
not required on after draft states.
If the linked BOM is deleted, it avoids to block
the MO usage with the following message:
The following fields are invalid: Bill of Material