How To Fix V1426 - The schedule line quantity is already: &1 &2

SAP Error Message - Details

• Message type: E = Error

• Message class: V1 - Verkaufsbelegbearbeitung

• Message number: 426

• Message text: The schedule line quantity is already: &1 &2

What causes this issue?

You have reduced the target quantity, although schedule lines for the
material already exist.

System Response

The system does not adjust the schedule lines already existing. The
cumulative order quantity of the existing schedule lines remains &V1&
&V2&.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message V1426 - The schedule line quantity is already: &1 &2 ?

  The SAP error message V1426 ("The schedule line quantity is already: &1 &2") typically occurs in the context of sales and distribution (SD) when there is an issue with the quantity of goods that are being processed in a sales order or delivery. This error indicates that the quantity you are trying to enter for a schedule line exceeds the quantity that has already been confirmed or allocated.
  Cause:
  
  Quantity Exceeded: The quantity you are trying to enter for a schedule line is greater than the quantity that has already been confirmed or allocated for that line.
  Delivery Issues: If you are trying to create a delivery or change an existing one, the delivery quantity may already be set, and you cannot exceed that quantity.
  Stock Availability: There may be stock availability issues where the system does not have enough stock to fulfill the requested quantity.
  Order Modifications: If there have been changes to the sales order or delivery that affect the quantities, this can lead to discrepancies.
  
  Solution:
  
  Check Schedule Line: Review the schedule line in the sales order or delivery to see the confirmed quantity. Ensure that the quantity you are trying to enter does not exceed this amount.
  Adjust Quantity: If you need to change the quantity, adjust it to be equal to or less than the confirmed quantity.
  Review Stock Levels: Check the stock levels in the system to ensure that there is enough stock available to fulfill the order. If stock is insufficient, you may need to procure more stock or adjust the order.
  Confirm Changes: If you have made changes to the sales order or delivery, ensure that all changes are saved and confirmed in the system.
  Consult Documentation: If you are unsure about the process or need further assistance, consult SAP documentation or your organization's SAP support team for guidance.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like VA02 (Change Sales Order), VL02N (Change Outbound Delivery), or VA03 (Display Sales Order) to review and modify the relevant documents.
  User Roles: Ensure that you have the necessary permissions to make changes to sales orders or deliveries.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to this error message.
  Training: If you frequently encounter this error, consider additional training on sales order processing and delivery management in SAP.
  
  By following these steps, you should be able to resolve the V1426 error and proceed with your sales order or delivery processing.