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How To Fix TT121 - '&1 (&2)' not allowed as source because there is a &3


SAP Error Message - Details

  • Message type: E = Error

  • Message class: TT - Extended Computer Aided Test Tool (eCATT) messages

  • Message number: 121

  • Message text: '&1 (&2)' not allowed as source because there is a &3

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  • 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 TT121 - '&1 (&2)' not allowed as source because there is a &3 ?

    The SAP error message TT121 '&1 (&2)' not allowed as source because there is a &3 typically occurs in the context of data transfer or data source configuration within SAP systems, particularly in the context of SAP BW (Business Warehouse) or data modeling.

    Cause:

    This error message indicates that the specified source (e.g., a data source or a table) is not allowed to be used because there is a restriction or a conflict with another object or setting. The placeholders in the message represent:

    • &1: The name of the object (e.g., data source or table).
    • &2: The technical name or identifier of the object.
    • &3: The reason for the restriction (e.g., a specific condition or another object that conflicts).

    Common causes for this error include:

    1. Data Source Restrictions: The data source may be restricted due to its configuration or the type of data it contains.
    2. Incompatible Data Types: The data types of the source and target may not match, leading to incompatibility.
    3. Existing Data Flows: There may be existing data flows or transformations that conflict with the new source being added.
    4. Authorization Issues: The user may not have the necessary authorizations to access or use the specified source.

    Solution:

    To resolve the TT121 error, consider the following steps:

    1. Check Configuration: Review the configuration of the data source or object mentioned in the error message. Ensure that it is set up correctly and is compatible with the target.

    2. Review Data Types: Verify that the data types of the source and target match. If there are discrepancies, you may need to adjust the data types or use a transformation to convert them.

    3. Examine Existing Data Flows: Look for any existing data flows or transformations that may be using the same source. If there are conflicts, you may need to modify or remove those flows.

    4. Authorization Check: Ensure that the user has the necessary authorizations to access the data source. If not, work with your SAP security team to grant the required permissions.

    5. Consult Documentation: Refer to SAP documentation or help resources for specific guidance related to the error message TT121. This may provide additional context or troubleshooting steps.

    6. SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide patches or updates.

    Related Information:

    • SAP BW Documentation: Review the SAP BW documentation for best practices on data source configuration and data modeling.
    • SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
    • Transaction Codes: Familiarize yourself with relevant transaction codes (e.g., RSA1 for Data Warehousing Workbench) that can help you navigate and troubleshoot data sources in SAP BW.

    By following these steps, you should be able to identify the root cause of the TT121 error and implement an appropriate solution.

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