Deactivating an active BW partner namespace can cause problems

What causes this issue?

You are deactivating a BW partner namespace that is currently active.

System Response

When you activate a BW partner namespace, the namespace is set to not
ready for input. This safety mechanism is deactivated when you reset the
active flag, and the assignment of object namespace and generation
namespace can be changed again.
The system does not check whether BW objects have already been created
in this namespace however.

How to fix this error?

You should only deactivate the BW namespace if it does not have any
usages yet, or if all usages have been deleted.

Procedure for System Administrators

If the assigned generation namespace of an object namespace is changed,
all runtime objects of this object namespace become inconsistent.
Changes to table RSNSPACE are subject to change recording and can be
displayed using the table history transaction (SCU3).

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.