How To Fix FDT_EXPRESSIONS837 - Mapping position &1 (table): Only one source table for mapping allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 837

• Message text: Mapping position &1 (table): Only one source table for mapping 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.

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 FDT_EXPRESSIONS837 - Mapping position &1 (table): Only one source table for mapping allowed ?

  The SAP error message FDT_EXPRESSIONS837 indicates that there is an issue with the mapping configuration in your SAP system, specifically related to the use of source tables in a mapping scenario. The error message states: "Mapping position &1 (table): Only one source table for mapping allowed." This typically occurs in the context of data transformation or mapping processes, such as those used in SAP Data Services or SAP Process Integration.
  Cause:
  The error is caused by attempting to use multiple source tables in a mapping position where only one source table is allowed. This can happen if:
  
  You have incorrectly configured the mapping to include more than one source table.
  There is a misunderstanding of the mapping logic that requires a single source table.
  The mapping design does not align with the expected structure defined in the transformation rules.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review Mapping Configuration:
  
  Open the mapping configuration in the relevant tool (e.g., SAP Data Services, SAP PI/PO).
  Check the mapping position indicated by the error message (replace &1 with the actual position number).
  Ensure that only one source table is defined for that mapping position.
  
  
  
  Modify the Mapping:
  
  If you find multiple source tables, decide which one should be used for the mapping.
  Remove any additional source tables that are not needed for that specific mapping position.
  
  
  
  Validate Mapping Logic:
  
  Ensure that the logic of your mapping aligns with the business requirements.
  If you need to combine data from multiple tables, consider using a join operation or a different mapping strategy that allows for multiple sources.
  
  
  
  Test the Mapping:
  
  After making the necessary changes, test the mapping to ensure that it works as expected without generating the error.
  
  
  
  Consult Documentation:
  
  If you are unsure about the mapping rules or configurations, refer to the SAP documentation or help resources specific to the tool you are using.
  
  
  
  Related Information:
  
  SAP Data Services: If you are using SAP Data Services, familiarize yourself with the data flow and transformation rules.
  SAP Process Integration (PI): If the error occurs in SAP PI, review the integration flow and ensure that the source system configurations are correct.
  Debugging Tools: Utilize debugging tools available in your SAP environment to trace the mapping process and identify where the configuration might be going wrong.
  
  By following these steps, you should be able to resolve the FDT_EXPRESSIONS837 error and successfully configure your mapping.