How To Fix UC0021 - &1: Conversion not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: UC0 - General Messages for SAP Consolidation

• Message number: 021

• Message text: &1: Conversion not possible

What causes this issue?

It was not possible to convert key &V1& in table UCM2000.
The system skips this key and the conversion continues with the next
key. Once the conversion is completed, the system deletes all successful
conversions from table UCM2000.

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?

After the conversion is finished, check the table UCM2000 and the log.
Not all existing entries could be converted.
Decide if you still need these entries. If you do need them
, correct the errors that prevented the conversion (as stated in the
log).
Start program UCCM351 again so that the corrected entries in UCM2000 can
be converted.

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 UC0021 - &1: Conversion not possible ?

  The SAP error message UC0021, which states "Conversion not possible," typically occurs during data conversion processes, such as when trying to convert data types or formats that are incompatible. This error can arise in various contexts, including data uploads, data migrations, or during the execution of certain transactions.
  Causes:
  
  
  Data Type Mismatch: The most common cause is a mismatch between the expected data type and the actual data being processed. For example, trying to convert a string that contains non-numeric characters into a numeric format.
  
  
  Invalid Data Format: The data being converted may not adhere to the expected format. For instance, date formats or currency formats that do not match the system's expectations can trigger this error.
  
  
  Null or Empty Values: Attempting to convert null or empty values can also lead to this error, especially if the conversion process does not handle such cases properly.
  
  
  Incompatible Structures: If you are working with structures or tables that have incompatible field definitions, this can lead to conversion issues.
  
  
  Solutions:
  
  
  Check Data Types: Review the data types of the fields involved in the conversion. Ensure that the source data matches the expected data type in the target field.
  
  
  Validate Data Format: Ensure that the data being processed adheres to the expected format. For example, if converting dates, make sure they are in the correct format (e.g., YYYY-MM-DD).
  
  
  Handle Null Values: Implement checks in your code or data processing logic to handle null or empty values appropriately before attempting conversion.
  
  
  Debugging: Use debugging tools to trace the point of failure in the conversion process. This can help identify the specific data causing the issue.
  
  
  Data Cleansing: If the error arises from data uploads or migrations, consider cleansing the data beforehand to ensure it meets the required standards.
  
  
  Consult Documentation: Review SAP documentation or community forums for specific guidance related to the context in which the error occurs.
  
  
  Related Information:
  
  
  Transaction Codes: Depending on where the error occurs, you may want to check specific transaction codes related to data processing, such as LSMW (Legacy System Migration Workbench) or others relevant to your scenario.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  
  
  Community Forums: Engage with SAP community forums or support channels where other users may have encountered and resolved similar issues.
  
  
  By following these steps, you should be able to diagnose and resolve the UC0021 error in your SAP environment.