SAP Message /SPE/DIRDLV023 - There is already a sales and distribution document with number &1

Diagnosis A direct outbound delivery with the number &V1& should be created.However, there is already a sales and distribution document (salesorder, delivery or billing document) with the same number. Probably, the number range for direct outbound deliveries is notconfigured properly in the connected EWM system. System Response The direct outbound delivery cannot be created. Procedure Contact you system administrator. Procedure for System Administration Ensure that there are no number range conflicts between sales anddistribution documents in ERP and direct outbound deliveries fromvarious EWM systems.