Field &1 for new/changed data records for table/view &2 in &3 "initial"

What causes this issue?

The field &V1& in table/view &V2& is in the enhancing BC Set/transport
request, but not in BC Set &V3&.

System Response

The field is copied into all data records in the BC Set/transport
request, into the BC Set &V3&, with an initial value, because a field
can be put in a BC Set for either all or no data records of a
table/view.
Missing field contents are not automatically read from the table/view in
the system.

How to fix this error?

Check whether any initial fields in the field &V1& of table/view &V2&
could cause problems in the system after BC Set activation.
You can synchronize the BC Set &V3& with the current data in all its
tables/views with "Adjust to Customizing Tables", or deselect the field,
in change mode of the BC Set maintenance transaction SCPR3.

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.