SAP Message VLA058 - Goods issue has not taken place. Delivery & cannot be changed

Diagnosis The goods issue for this delivery has not yet been posted or hasalready been cancelled. You cannout carry out the delivery confimationat this time. You can however display the document. Procedure Choose "Display <-> Change Ctrl-F1" to display the delivery. Post thegoods issue for the delivery. Then you can carry out the deliveryconfirmation.