Order unit & not convertible into unit & of requisition

What causes this issue?

You have changed the order unit for an item that references a purchase
requisition. The system cannot convert the order unit into the unit of
the requisition (because neither unit has a dimension for example). The
system will therefore convert using the factor 1.

How to fix this error?

The ordered quantity in the purchase requisition will be updated in the
amount of the PO quantity. In this case, too, conversion will be carried
out using the factor 1. You may have to manually flag the requisition as
closed (by deleting it).


&EXAMPLES&
You have a purchase requisition for 100 pcs. In the PO, you change the
order unit to "case". You order 10 cases from the supplier (each case
contains 10 pcs.). However, the ordered quantity in the purchase
requisition is only increased by 10 pcs. In this instance, a quantity of
90 pcs. would remain open.

Error message extract from SAP system. Copyright SAP SE.