Message type: E = Error
Message class:  CNV_20900 - Message class for package CNV_20900 
Message number: 236
Message text: Only &1 messages being displayed.(Account group information check)
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_20900236, which states "Only &1 messages being displayed. (Account group information check)," typically occurs during data migration or conversion processes, particularly when using SAP's tools for data transfer, such as the SAP S/4HANA Migration Cockpit or other data migration tools.
Cause: This error message indicates that there is an issue with the account group information in the data being processed. The specific cause can vary, but common reasons include: Missing Account Group: The account group specified in the data does not exist in the target system. Incorrect Mapping: The mapping of account groups from the source system to the target system is incorrect or incomplete. Data Format Issues: The data format for the account group may not match the expected format in the target system. Authorization Issues: The user executing the migration may not have the necessary authorizations to view or process certain account groups.
Solution: To resolve this error, 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_20900235 Only &1 messages being displayed.(New account existence check)
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20900234 Only &1 messages being displayed.(Old account existence check)
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20900237 Priority control check in merge groups:
What causes this issue?  If two different vendor numbers are maintained in the mapping which are merged to the same new vendor number and if priority ...
CNV_20900238 Issue found
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.