Do not fill the quantity in the supplementary unit

What causes this issue?

If the supplementary unit is not filled or if there is no supplementary
unit for the commodity code, you cannot fill the quantity in the
supplementary unit.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Maintain the supplementary unit for the commodity code, if possible, or
delete the quantity in the supplementary unit.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.