SAP Message AO089 - You entered a unit of measure w/o entering a quantity - enter quantity

Diagnosis
You entered a unit of measure in &V1&, but you did not enter a quantityin the user field.

System Response
The system informs you of this.
You can maintain the unit of measure without entering a quantity.

Procedure
Check your entry of unit of measure &V1& without a quantity.
If you wish, enter a quantity.
Confirm this warning message.