No tables for object &1 have a cust. delivery class

What causes this issue?

None of the tables in the individual transaction &V1& have appropriate
delivery classes for customizing data, or they are system objects (e.g.
table T000, TADIR, CVERS, ....).
The tables must not be system objects and they must have one of the
following delivery classes (transaction SE11):
'C': customizing table, maintained by customers, not an SAP import
'G': customizing table, protected against SAP UPD, only INS allowed
'E': control table, SAP and customers have their own key areas
SPACE: is also accepted as a customizing delivery class
<ZK>System objects:</> System objects are tables which are in the ABAP
Dictionary, or are internal SAP System tables. They cannot be
transported, and so not be used in BC Sets.

System Response

You cannot use the object &V1& in BC Sets.

How to fix this error?

To be able to use the object in BC Sets, you must change the delivery
classes of the object tables. Contact the SAP developer responsible.
If all object tablles have a customizing delivery class, and this
message still appears, at least one table is a system object. In this
case, you cannot put object &V1& in the BC Set.

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.