Sales Order

Dear experts, We have created one Sales Order refer to the below screen, In Order quantity, only Nos UOM is appearing. Could you please suggest how to add Liters UOM for this part.

The UPM Class of that part indicates it is for countable units (EA, DZ, BOX10, etc…)
Is Liters a UOM of that Class?

I see that is a Qty Bearing part. So you “stock” it. Do you have a tank that the supplier fills, or do they deliver tanks or other containers of fixed volume? If its the later, you could make a UOM of the container size (like 100G for a 100 gal tank).

And for the record, a gas that compresses to a liquid, should use a Mass based UOM