As the message says, for both Print UOM and Inventory UOM, the based UOM should be the same. You need to check your Unit of Measure screen to see whether you can change to align them.
@AanHGTS Thank you for your reply.
It appears that the uom you are using has to be the same Base UOM. which means you can change to m, cm, dm if base uom is mm, which is for length. if you change to Litter, then system will prompted the error.
We don’t have clear guideline on the settings on the UoM, thus have some issues arise.
Thank you.