CDS view of a view extend cannot be changed, in this case (&1->&2)

Message type: E = Error

Message class: DDLS - For DDL source handling

Message number: 274

Message text: CDS view of a view extend cannot be changed, in this case (&1->&2)

What causes this issue?

The enhancement of an existing CDS view &V1& was assigned to a different
CDS view &V2&. This change is not allowed.
Due to an earlier programming error, this change may still have been
carried out.

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?

A new enhancement has to be created and this can then be assigned to CDS
view &V2&.
If this message occurs as a warning during an upgrade:
In this case, the change was still carried out. If &V1& is not activated
in its latest version during the upgrade, then &V1& should be
reactivated manually after the upgrade. This is required so that the
fields of the view extend of &V1& are removed.