You have not specified a unit of measure

What causes this issue?

When creating a complete quantitive master inspection characteristic or
a validity period, you did not enter a unit of measure.

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?

Ignore this message if you do not want to define a unit of measure for
the master inspection characteristic.
<ZH>or</>
Enter a unit of measure by choosing "quantitative data".

Error message extract from SAP system. Copyright SAP SE.