How To Fix M8664 - Enter a negative value

SAP Error Message - Details

• Message type: E = Error

• Message class: M8 - Invoice Verification/Valuation

• Message number: 664

• Message text: Enter a negative value

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 M8664 - Enter a negative value ?

  The SAP error message M8664 ("Enter a negative value") typically occurs in the context of inventory management or material movements, where a negative quantity is expected but not provided. This error can arise in various scenarios, such as when trying to post a goods issue, return, or any transaction that requires a negative quantity to reflect a decrease in stock.
  
  Cause:
  
  Incorrect Input: The user may have entered a positive quantity when a negative quantity is required.
  Transaction Type: The transaction being performed (e.g., goods issue, stock transfer) inherently requires a negative value to indicate a reduction in inventory.
  
  Configuration Issues: There may be configuration settings in the material management module that enforce certain rules regarding quantity entries.
  
  
  Solution:
  
  Check Input Values: Ensure that you are entering a negative value where required. For example, if you are processing a goods issue, make sure to enter the quantity as a negative number.
  Review Transaction Type: Verify that the