How To Fix CNV20200858 - &1 not yet known! Conversion rule for &2=&3 not applicable

CNV20200858 - Overview

• Message type: E = Error

• Message class: CNV20200 - Messages for development class CNV_20200

• Message number: 858

• Message text: &1 not yet known! Conversion rule for &2=&3 not applicable

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.

CNV20200858 - Details

• The SAP error message CNV20200858 typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that a specific conversion rule for a particular field or data element is not defined or applicable in the current context.
  
  Cause:
  
  Missing Conversion Rule: The error suggests that there is no defined conversion rule for the specified source and target fields. This can happen if the data model has changed or if the migration project is not fully configured.
  Incompatible Data Types: The source and target fields may have incompatible data types or formats, leading to the inability to apply a conversion rule.
  
  Configuration Issues: There may be issues in the configuration of the migration project, such as missing or incorrect mapping of fields.
  
  
  Solution:
  
  Check Conversion Rules: Review the conversion rules defined in the migration project. Ensure that there is a valid rule for the specified source