Message type: E = Error
Message class:  VTX - Messages from tracking notification processing 
Message number: 826
Message text: Delivery date is not reset
When the cancellation was reset, the delivery date was not reset
automatically.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Check the delivery date. Transfer the delivery date if necessary from
the current tracking point.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message VTX826, which states "Delivery date is not reset," typically occurs in the context of the SAP system when dealing with sales and distribution (SD) processes, particularly when handling delivery dates in sales orders or deliveries.
Cause: The error usually arises due to one of the following reasons: Inconsistent Data: The delivery date may not be reset due to inconsistencies in the data related to the sales order or delivery. This can happen if the delivery date is locked or if there are dependencies on other documents.
Configuration Issues: There may be configuration settings in the SAP system that prevent the delivery date from being changed. This could be related to the sales document type, item category, or other related settings. Status of the Document: If the sales order or delivery has already been processed or is in a status that does not allow changes, the system will not permit the reset
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