Unit of Measure (UoM) serve to specify units in the financial system.
The units "Unit", "Hour" and "Day" have special meaning:
The following values are constants and should not be modified or deleted. However, it is OK to disable UoMs and it might be OK to add new values if you know what you are doing.
category_id | category
-------------+----------
320 | Hour
321 | Day
322 | Unit
323 | Page
324 | S-Word
325 | T-Word
326 | S-Line
327 | T-Line
328 | Week
329 | Month
