Message type: E = Error
Message class:  CNV_20800 - Message class for CNV_20800 
Message number: 179
Message text: Check for account group:
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.
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.
The SAP error message CNV_20800179 typically relates to issues encountered during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This specific error indicates that there is a problem with the account group configuration in the system.
Cause: The error message CNV_20800179 Check for account group usually arises due to one or more of the following reasons: Missing Account Group: The account group specified in the migration data does not exist in the target system. Incorrect Configuration: The account group may not be properly configured or may not be compatible with the data being migrated. Data Inconsistencies: There may be inconsistencies in the data being migrated, such as invalid or missing values for required fields related to the account group. Authorization Issues: The user performing the migration may not have the necessary authorizations to access or modify the account group settings.
Solution: To resolve the error CNV_20800179, you can take the
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_20800178 Check for customer number mapping:
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20800174 No changes made, settings made in previous run will be considered
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20800180 Participating customers have different Billing block (KNVV-FAKSD)
 Diagnosis According to the mapping, you want to merge two or more old customer records into one target customer record. However, not all the old reco...
CNV_20800181 Participating customers have different Customer group (KNVV-KDGRP)
 Diagnosis According to the mapping, you want to merge two or more old customer records into one target customer record. However, not all the old reco...
Click on this link to search all SAP messages.