Field dependency for object & could not be generated

What causes this issue?

No foreign key dependencies of key fields from &V1& to the predecessor
&V2& are defined in the data dictionary. This means that no proposal for
the field dependency between &V1& and &V2& can be created.

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?

Define the relationship between the fields of &V1& and the corresponding
fields of &V2& in the "Field Dependency" manually.

Error message extract from SAP system. Copyright SAP SE.