Unit of measure &1 cannot be converted to unit &2 of business process

What causes this issue?

You are using the business process &V3&. This business process is
assigned the driver unit of measure &V2&. Your time recording data was
recorded with the unit &V1&. The two units cannot be converted into one
another.

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?

Use a business process compatible with the unit &V1&.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.