SAP Message 63503 - Number range object & & & does not have internal number assignment

Diagnosis The Customizing setting for number range object &V1&, sub-object &V2&and interval &V3& is 'External number assignment'. It must be set to'Internal number assignment'. System Response Further processing is cancelled. Procedure Inform your system administrator. The number assignment for numberrange object &V1&, sub-object &V2& and interval &V3& must be set to'Internal number assignment'.