How To Fix TR420 - Packages must begin with A-Z, &1, or a namespace prefix

SAP Error Message - Details

• Message type: E = Error

• Message class: TR - Change and Transport System

• Message number: 420

• Message text: Packages must begin with A-Z, &1, or a namespace prefix

What causes this issue?

The name of the package is invalid, since it does not start with A-Z,
$, or with a valid namespace prefix.

System Response

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

How to fix this error?

Choose a valid name for the package.
You can display a list of the namespace prefixes in the SAP System with
the Transport Organizer tools (transaction <DS:TRAN.SE03>SE03</>).
Choose <LS>Objects</> -> <LS>Namespace Information System</>, and then
<LS>Select namespace</>.

Error message extract from SAP system. Copyright SAP SE.