How To Fix CNV_CMIS_A_20_FUNC300 - System exception ASSIGN_CASTING_ILLEGAL_CAST has occurred for table &1

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_CMIS_A_20_FUNC - Message texts for CNV_CMIS_A_20 function modules

• Message number: 300

• Message text: System exception ASSIGN_CASTING_ILLEGAL_CAST has occurred for table &1

What causes this issue?

The system is trying to read data from a table whose fields contain
data types that cannot be converted to the character format (for
example, floating point (FLTP) fields). This error has occurred because
the current version of the function module CNV_CMIS_A_20_RFC_RD_TAB is
unable to process the table.

System Response

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

How to fix this error?

Exclude the table from analysis and perform manual comparison.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_CMIS_A_20_FUNC300 - System exception ASSIGN_CASTING_ILLEGAL_CAST has occurred for table &1 ?

  The SAP error message CNV_CMIS_A_20_FUNC300 with the system exception ASSIGN_CASTING_ILLEGAL_CAST typically occurs during data conversion processes, particularly when using the SAP Conversion Management (CM) tools. This error indicates that there is an issue with data type casting or assignment in the specified table.
  Cause:
  
  Data Type Mismatch: The most common cause of this error is a mismatch between the expected data type and the actual data type of the fields in the specified table (&1). For example, if the program expects a numeric value but encounters a character string, this error can occur.
  Inconsistent Data: The data in the source table may not conform to the expected format or type, leading to casting issues during the conversion process.
  Custom Code Issues: If there are custom enhancements or modifications in the conversion program, they might be causing the illegal cast.
  
  Solution:
  
  Check Data Types: Review the data types of the fields in the specified table. Ensure that the data being processed matches the expected types. You can do this by checking the Data Dictionary (SE11) for the table structure.
  Data Validation: Validate the data in the source table to ensure that it adheres to the expected formats. Look for any anomalies or inconsistencies that could lead to casting issues.
  Debugging: If you have access to the ABAP code, you can debug the program to identify the exact point of failure. This will help you understand which field is causing the issue.
  Adjust Custom Code: If there are custom modifications, review and adjust the code to handle the data types correctly.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error. There may be patches or updates that resolve known issues related to this error message.
  
  Related Information:
  
  Transaction Codes: You may want to use transaction codes like SE11 (Data Dictionary), SE80 (Object Navigator), or ST22 (Dump Analysis) to investigate further.
  SAP Community: Engaging with the SAP Community forums can provide insights from other users who may have encountered similar issues.
  Documentation: Review the official SAP documentation related to the Conversion Management tools for any specific guidelines or best practices.
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance.