Order units

Question:
We are on 4.6C version. We went live in 2002 and we want to know what are all the units of measurements used as order units in the purchase orders.
Is there anyway this information can be obtained easily any reports or any method/s to use to get this information or any other method.
Regards.
Answer:
quick and dirty via SE16N on table EKPO.
or with more effort in creation via TAANA.