I am hoping this is an easy one. I thought it was related to having quantity on hand, but I adjusted quantity out and still can’t change this.
Once any transaction has occurred, changing the Inventory UOM of a part is nigh onto impossible (thanks be to Enron). There is a process described in the System Help for the Part UOM Conversion program… good luck.
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Yeah, not funny.
Once there is a transaction you are locked in.
The only way out AFAIK is to use UOM Conversion and move the part to a new UOM Class and then assign the new UOM Code you want.
We’ve done this now successfully many times, it is still a drag as you have to remove any open reference of this part, the error message in the conversion will tell you, like Sales Orders, RMAs, Material Queue, you name it.
But at least there is an option now 
In old Vista/Vantage days we removed all transaction references (for newly created parts) which made the Inv UOM available again, did I just say this? No I didn’t…
Cheers
While using an intermediate UOM Class might work, it can cause another issues where you then can’t delete the intermediate UOM Class.
We opted for the KISS rule. Since it was only one part we were trying to change, we just decided to create a new part number and set it up correctly and then adjust inventory/BOMs…
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