How To Fix FG821 - Choose a unique identifier

SAP Error Message - Details

• Message type: E = Error

• Message class: FG - Program Error Messages

• Message number: 821

• Message text: Choose a unique identifier

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 FG821 - Choose a unique identifier ?

  The SAP error message FG821, which states "Choose a unique identifier," typically occurs in the context of creating or processing documents in SAP, such as during the creation of a production order, purchase order, or other transactional processes where unique identifiers (like document numbers or item numbers) are required.
  Cause:
  
  
  Duplicate Entry: The most common cause of this error is that the system has detected a duplicate entry for a field that requires a unique identifier. This could be due to:
  
  Attempting to create a new record with an identifier that already exists in the database.
  A configuration issue where the system is not correctly generating unique identifiers.
  
  
  
  Configuration Issues: In some cases, the configuration settings for number ranges or document types may not be set up correctly, leading to conflicts.
  
  
  User Input Error: The user may have inadvertently entered a value that is not unique, such as a duplicate item number or document number.
  
  
  Solution:
  
  
  Check for Duplicates: Review the entries you are trying to create or modify. Ensure that the identifier you are using is unique and does not already exist in the system.
  
  
  Use the Number Range Functionality: If applicable, check the number range settings for the document type you are working with. Ensure that the number range is correctly defined and that it allows for the creation of new unique identifiers.
  
  
  Adjust Configuration: If you have access to configuration settings, verify that the settings for the relevant document types and number ranges are correctly configured to prevent duplicates.
  
  
  Consult with IT or SAP Support: If you are unable to resolve the issue, it may be necessary to consult with your IT department or SAP support team. They can help investigate the issue further, especially if it is related to system configuration or data integrity.
  
  
  Review User Input: Ensure that all user inputs are correct and conform to the expected formats. Sometimes, simple typographical errors can lead to this error.
  
  
  Related Information:
  
  Transaction Codes: Depending on the context of the error, you may be using various transaction codes (e.g., ME21N for purchase orders, CO01 for production orders).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  Documentation: Review SAP documentation related to the specific module you are working with (e.g., MM for Materials Management, PP for Production Planning) for more detailed guidance on unique identifiers and number ranges.
  
  By following these steps, you should be able to identify the cause of the FG821 error and implement a solution to resolve it.