Should/can you reinstate a superseded revision once the next revision has been released? ECO was released (ex: Rev A to Rev B) but now engineers (per customer) want to "obsolete" the ECO and revert back to previous revision (rev A). How do you properly handle revisions?
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Configuration Management: Can you reinstate a superseded revision
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I think it would be cleaner to go to a Rev C, reinstating Rev A, with the rationale that Rev B was dud. This would give you a traceability and a record of why Rev B is not valid, rather than erasing Rev B, only to possibly wind up wasting time revisiting and recreating Rev B once all the parties in the know are no longer around to explain why that's not appropriate
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Contractually you can reference Rev A... IRS's solution is cleaner and probably less confusing and less prone to error, in case someone 'accidentally' comes across Rev B, and uses it in lieu of Rev A thinking it is the latest.
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We also used to use something called Design Decision Record (DDR) that went into more detail than the typical Engineering Change Notice (ECN) form allows. DDRs are free-form, so you can include lots of text, calculations, etc. that justify a change. A Rev C ECN would rescind Rev B and reference a DDR to explain why.
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