Field &-& for transparent implementation inserted

What causes this issue?

An additional field had to be included so that the helpview could be
implemented as transparent (as a database view).
The field is assigned a flag, indicating that it should not be displayed
with the F4 help.

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&
A helpview must contain all the key fields of the primary table so that
it can be created on the database and used for the F4 help. The
language field must also be included in the view for text relationships.

Error message extract from SAP system. Copyright SAP SE.