Unit code &1 of linear information elements not equal to backend UoM

What causes this issue?

Unit code &1 of linear information elements does not equal the
unit of measurement in the backend system.

System Response

The system cannot change the unit of measurement for linear data in the
backend system.

How to fix this error?

Change the unit code so that it is equal to the unit of measurement for
linear data in the backend system or enter a unit code for all three
elements: StartPointMeasure, EndPointMeasure, and LengthMeasure.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.