Quantities with differing units added in the object list

What causes this issue?

The actual, plan, target or control quantity can be made up of
quantities with differing units of measure. This means that the quantity
displays in the object list do not convey readily usable information.

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?

To obtain the exact quantities, double-click the cost element analysis
for the individual objects. The quantities are displayed there with the
relevant units of measure.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.