# Drawing documentation: Is possible to keep the original drawing valid when revised version is released?

is possible (by European standards) to have two (or more) valid drawings with same drawing number but different revision indexes?

For example:

• 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.)

Thanks

P/N        LENGTH     PITCH

• I agree with typical practice (I use it too, consider it correct), but I'd like to support my feeling by some hard-evidence from some standard. Only what I've found yet is (ČSN) EN 82045-1 Paragraph 4.5.3 which describes the typical practice. BUT right below is paragraph 4.5.4 which describe opposite system - more than 1 valid revisions in one moment. (I don't have an English version of the standard, so I'm unable to cite it precisely.) Dec 10, 2020 at 13:40