Please restore production order number in recent update. All production number deleted automatically.
Due to formate change, u have to give manually, probably.
I can reproduce this bug. Reference numbers on pre-existing production orders have disappeared. But reference numbers can be assigned, either manually or automatically, to new or old production orders. All newly assigned reference numbers are retained.
Should be fixed in the latest version (21.2.70)
@mmi, you will have to test this. My production test business has already been altered, so I cannot.