Field &1 with conversion exit '&3' is associated to field &2 with '&4'

What causes this issue?

Field &V1& with conversion exit '&V3&' is associated to field &V2& with
conversion exit '&V4&'. They have different conversion exits.

System Response

As field &V1& is associated to field &V2&, it will have the same
conversion exit as field &V2&. This may lead to unexpected external
format when display values in field &V1&. If field &V1& has incompatible
values (such as, it has a different data type from field &V2&), the
conversion exit may not work at all.

How to fix this error?

Please associate two fields with the same conversion exit instead.

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.