is possible (by European standards) to have two (or more) valid drawings with same drawing number but different revision indexes?
DRW-001= Some Bolt M20x50
DRW-001a= Same bolt but length changed (M20x60)
And then BOM(s) where both (DRW-001, DRW-001a) are used for bolts M20x50 respectively M20x60?
I know this is far from good solution, but it is even legal/valid?
(My 6th sense tells since a new revision is released, all previous versions became invalid. But can't find any stamdard citation supporting my feeling.)