SAP Message M8416 - Quantities and units of measure (table parameter &, line &) not permitted

Diagnosis
You have entered a value in one of the following quantity fields inline &V1& of table Itemdata (reference to a service POwith non-service based invoice verification or reference to a blanketPO), even though this is not permitted:
- Quantity (QUANTITY)
- PO unit of measure (PO_UNIT)
- PO unit of measure in ISO code (PO_UNIT_ISO)
- Quantity in PO price unit of measure (PO_PR_QNT)
- PO price unit of measure (PO_PR_UOM)
- PO price unit of measure in ISO code (PO_PR_UOM_ISO)

Procedure
Enter an initial value in the all of the above quantity fields.

350568BAPI: Error with service orders