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When do you change top level assembly revision?

When do you change top level assembly revision?

When do you change top level assembly revision?

(OP)
Hello and good day to all.

I guess this issue was discussed many times, but I really need your advice:

Our product has 2 levels - PCB assemblies on level 2 and electro-mechanical assembly on level 1.
Today we are moving up revision for level 1 every time there is a change in any item revision in level 2. The change in level 2 can be a change in the PCB assembly or even when there is a change in the work instructions document. When we have a change in level 1 item the revision is of course moving up.
Although this method causing a lot of revision changes it's OK.

My question is what do you do or suggest to do if I have a future change and I need to make another change for the current production? How do I manage the revisions?
Let me explain: I made a change in the printed logo on the cover that is in level 1 and moved the revision from 8 to 9. The new covers aren't yet in stock so we can still produce under revision 8.
But now I need to make an urgent change in a level 2 item that needs to be implemented immediately for all revisions (8 & new 9)
I can't change revision 8 to 9. Do I open a new revision 8.1 for revision 8 and un-released revision 9 or move to revision 10?

Thank you for all your help and advices.

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