Error in the definition of field &

What causes this issue?

In the definition of summary tables, the modified fields of the object
table that does not have a sender/reciever relationship must be entered
as data fields.
This error can be due to the following:
a) Field &V1& does not exist in table &V2&.
a) Field &V1& is defined as a key field and not as a data field.
b) The domain of field &V1& is not called &V4&.

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?

Note the above requirements.

Error message extract from SAP system. Copyright SAP SE.