Reference size &1 not defined (function module &2)

What causes this issue?

An evaluation of condition records with reference magnitude &V1& is not
possible.
The program called for evaluation cannot process reference magnitude
&V1&.

System Response

The condition record is not evaluated.

How to fix this error?

Contact your system administrator, as a program error has occurred.
The error occurred in function module &V2&.
Either this was called with incorrect data, or evaluation of condition
records with reference magnitude &V1& is not programmed.
The condition record concerned has (internal) number &V3&, and
condition item number &V4&.

Error message extract from SAP system. Copyright SAP SE.