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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

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 transaction type you are using is appropriate for the action you are trying to perform. If you are trying to return stock, ensure you are using the correct return transaction.
  Consult Documentation: Refer to SAP documentation or help files for the specific transaction you are using to understand the expected input values.
  User Training: If this error is common among users, consider providing additional training on how to correctly enter values in SAP for specific transactions.
  Check Configuration: If the issue persists, consult with your SAP administrator or functional consultant to review the configuration settings related to inventory management and ensure they are set up correctly.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes (e.g., MIGO for goods movements, MB1A for goods issues) and their expected input formats.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Forums: Engage with SAP community forums or user groups for additional insights and solutions from other users who may have encountered the same issue.
  
  By following these steps, you should be able to resolve the M8664 error and successfully complete your transaction in SAP.