SAP Message USMD1231 - Data model &1, entity type &2: Namespace &3 has an error

Diagnosis The namespace you entered is not valid. You can find the namespaces in database table TRNSPACET. SAP Note 105132explains how to reserve a namespace. Procedure If you do not want to use a customer-specific namespace, use /MDG/. Ifyou do not enter a namespace, /MDG/ is used automatically.