How To Fix CNV_DMC_MC103 - Cannot assign rule; source structure is not mapped to a target structure

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_MC - Migration Object Modeler

• Message number: 103

• Message text: Cannot assign rule; source structure is not mapped to a target structure

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 CNV_DMC_MC103 - Cannot assign rule; source structure is not mapped to a target structure ?

  The SAP error message CNV_DMC_MC103 indicates that there is an issue with the mapping of source and target structures in a data migration or conversion process, typically when using the SAP Data Migration Cockpit or similar tools. This error occurs when a rule cannot be assigned because the source structure is not properly mapped to the target structure.
  Cause:
  
  Missing Mapping: The source structure (the data you are trying to migrate) does not have a corresponding mapping to the target structure (the structure in the target system).
  Incorrect Configuration: The configuration settings for the data migration might be incorrect or incomplete.
  Data Model Changes: Changes in the data model of either the source or target system that have not been reflected in the mapping.
  Incompatible Structures: The source and target structures may not be compatible due to differences in data types, lengths, or other attributes.
  
  Solution:
  
  
  Check Mapping Configuration:
  
  Go to the mapping configuration in the Data Migration Cockpit.
  Ensure that all necessary source fields are mapped to the corresponding target fields.
  If any fields are missing, add the appropriate mappings.
  
  
  
  Review Data Structures:
  
  Verify that the source and target structures are correctly defined and that they match the expected formats.
  Check for any recent changes in the data model that may have affected the mapping.
  
  
  
  Adjust Rules:
  
  If you are using transformation rules, ensure that they are correctly defined and that they reference the correct source and target fields.
  Modify or create new rules as necessary to ensure proper mapping.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or guides related to the specific data migration process you are using. This can provide insights into common issues and their resolutions.
  
  
  
  Testing:
  
  After making changes, perform a test migration to ensure that the mappings are now functioning correctly and that the error does not reoccur.
  
  
  
  Seek Support:
  
  If the issue persists, consider reaching out to SAP support or consulting with a technical expert who specializes in SAP data migration.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as LTMC (for the Migration Cockpit) or LTMOM (for the Migration Object Modeler) to manage your migration objects and mappings.
  SAP Notes: Check for any SAP Notes related to the specific version of the Data Migration Cockpit you are using, as they may contain fixes or workarounds for known issues.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to resolve the CNV_DMC_MC103 error and successfully map your source and target structures for data migration.