How To Fix FDT_EXPRESSIONS657 - Source step &1 for mapping is not defined in sequence

FDT_EXPRESSIONS657 - Overview

• Message type: E = Error

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

• Message number: 657

• Message text: Source step &1 for mapping is not defined in sequence

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_EXPRESSIONS657 - Source step &1 for mapping is not defined in sequence ?

  The SAP error message FDT_EXPRESSIONS657 indicates that there is an issue with the mapping configuration in your SAP Data Services or SAP Data Intelligence environment. Specifically, it means that a source step referenced in a mapping sequence is not defined or recognized.
  
  Cause:
  
  Missing Source Step: The source step that is being referenced in the mapping sequence does not exist or has been deleted.
  Incorrect Mapping Configuration: The mapping may have been incorrectly configured, leading to references to non-existent steps.
  Changes in Data Flow: If there have been recent changes to the data flow or mapping, it may have resulted in broken references.
  Versioning Issues: If multiple versions of the mapping exist, the one being executed may not have the correct source step defined.
  
  
  Solution:
  
  
  Check Mapping Configuration:
  
  Open the mapping in the Data Services Designer or relevant tool.
  Verify that all source steps referenced in the mapping are correctly defined and exist in the sequence.
  
  
  
  Recreate Missing Steps:
  
  If a