There may still be objects in this package in other SAP systems

What causes this issue?

You want to change central attributes of the package &V1& which could
possibly also affect other SAP Systems.

How to fix this error?

Before you make the changes, ensure that there are no original objects
of the ABAP Workbench in other systems of the system group that belong
to package &V1&.
Also see the documentation on <DS:DE.DEVCLASS>packages</>.

Error message extract from SAP system. Copyright SAP SE.