How To Fix CNV_00001108 - Conversion routine not defined for field &2 of table &1

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_00001 - Message class for CWB settings maintenance programs

• Message number: 108

• Message text: Conversion routine not defined for field &2 of table &1

What causes this issue?

Conversion routine was not defined for field &V2& of table &V1&,
although this field is amongst the fields to be converted.

System Response

The conversion program for this table will not be generated properly.

How to fix this error?

Provide a correct conversion routine for field &V2& of table &V1& or
mark the field as 'Ignored'.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_00001108 - Conversion routine not defined for field &2 of table &1 ?

  The SAP error message CNV_00001108 indicates that there is a missing conversion routine for a specific field in a table during a data conversion process. This error typically arises in the context of data migration or conversion projects, particularly when using SAP's Data Migration tools or the SAP S/4HANA Migration Cockpit.
  Cause:
  The error occurs when the system attempts to convert data from one format to another, but it cannot find a defined conversion routine for the specified field in the specified table. This can happen for several reasons:
  
  Missing Custom Logic: If the field requires a specific conversion logic that has not been implemented or defined in the system.
  Incorrect Configuration: The configuration for the data migration might be incomplete or incorrect, leading to the absence of the necessary conversion routines.
  Field Type Mismatch: The source and target field types may not match, and no conversion routine is available to handle the transformation.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the Field Definition: Verify the field definition in the source and target tables. Ensure that the field types are compatible and that any necessary conversion logic is defined.
  
  
  Define Conversion Routine: If a conversion routine is indeed missing, you may need to create one. This can be done by:
  
  Implementing a custom conversion routine in ABAP if the conversion logic is complex.
  Using standard SAP conversion routines if they are available for the field type.
  
  
  
  Review Migration Configuration: Go through the migration configuration settings to ensure that all necessary mappings and conversion routines are correctly set up.
  
  
  Consult Documentation: Refer to SAP documentation or notes related to the specific migration tool you are using. There may be specific guidelines or updates that address this issue.
  
  
  Testing: After implementing the necessary changes, perform a test run of the migration to ensure that the error is resolved.
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like SE11 (Data Dictionary), SE80 (Object Navigator), or SE37 (Function Module) to check or create conversion routines.
  SAP Notes: Look for relevant SAP Notes that might provide additional insights or solutions for this specific error.
  Data Migration Tools: Familiarize yourself with the specific data migration tools you are using, such as the SAP S/4HANA Migration Cockpit or SAP Data Services, as they may have specific requirements for conversion routines.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.