How To Fix /SAPAPO/FOT811 - Negative quantity is not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/FOT -

• Message number: 811

• Message text: Negative quantity is not allowed

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/FOT811 - Negative quantity is not allowed ?

  The SAP error message /SAPAPO/FOT811 Negative quantity is not allowed typically occurs in the context of SAP Advanced Planning and Optimization (APO) when a negative quantity is being processed in a transaction where only positive quantities are valid. This can happen in various scenarios, such as during the creation of planned orders, purchase orders, or when dealing with stock levels.
  Causes:
  
  Incorrect Data Entry: A user may have inadvertently entered a negative quantity in a field that only accepts positive values.
  Master Data Issues: There may be inconsistencies or errors in the master data, such as product master or location data, that lead to negative quantities being calculated.
  Planning Parameters: The planning parameters or settings may not be configured correctly, leading to negative quantities in the planning run.
  Stock Levels: If the system is trying to allocate or plan for stock that is not available or is incorrectly set up, it may result in negative quantities.
  
  Solutions:
  
  Check Input Values: Review the input values for the transaction that triggered the error. Ensure that all quantities are positive and valid.
  Review Master Data: Check the relevant master data (e.g., material master, location master) for any inconsistencies or errors that could lead to negative quantities.
  Adjust Planning Parameters: If the error is related to planning runs, review and adjust the planning parameters to ensure they are set up correctly.
  Stock Overview: Use the stock overview transaction to check the current stock levels and ensure that they are correctly maintained.
  Debugging: If the issue persists, consider debugging the process to identify where the negative quantity is being introduced. This may require technical assistance from an SAP ABAP developer.
  Consult Documentation: Refer to SAP documentation or notes related to the specific transaction or process to see if there are known issues or additional configuration steps required.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as /SAPAPO/SDP94 (for planning) or /SAPAPO/MC90 (for stock overview).
  SAP Notes: Check SAP Notes for any updates or patches that may address this issue.
  User Forums: Engage with SAP community forums or user groups for insights from other users who may have encountered similar issues.
  
  If the problem continues after trying the above solutions, it may be beneficial to reach out to your SAP support team or consult with an SAP expert for further assistance.