& UoM is not maintained for this material. Change as necessary.

What causes this issue?

The unit of measure has to be maintained for the material.

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?

Check if the unit of measure which was entered is correct.
Maintain the unit of measure in the material master for the material.

Error message extract from SAP system. Copyright SAP SE.