The info structure & is in the customer namespace

What causes this issue?

You want to create, change or delete the archive information structure
&V1&. The archive information structure &V1& belongs to the customer
namespace.

How to fix this error?

When you create archive information structures which are intended for
delivery to customers, give them names names beginning with 'SAP'.
Otherwise make sure that the archive info structure is not contained in
the delivery.

Error message extract from SAP system. Copyright SAP SE.