No namespace entries for SAP or customer name range

What causes this issue?

Object &V1& &V2& cannot be edited because there is no corresponding
entry for the SAP or customer name range in the namespace table.
Object names that do not begin with a namespace prefix (1st character
"/") belong to the standard namespace, which is subdivided into a name
range for SAP and a name range for customer developments. To edit
objects from these name ranges, the following entries must exist in the
namespace table:

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

/0CUST/ Objects from the customer name range
/0SAP/ Objects from the SAP name range
There is no entry in your SAP System corresponding to &V3&.

System Response

Editing is terminated.

How to fix this error?

Have your system administrator make the missing entries in the
namespace table.
Maintain the namespace table with the <DS:TRAN.SE03>Transport Organizer
Tools</> under <LS>Administration</> -> <LS>Display/Change Namespaces
</> The table entries must have the following attributes:
Namespace Namespace role SSCR popup SAP standard
========== =============== ========== ============
/0CUST/ P Off Off
/0SAP/ C On On
With these entries, the license fields remain empty. The "Only gen.
objs." flag remains deactivated.

Error message extract from SAP system. Copyright SAP SE.