Message type: E = Error
Message class:  CNV_20200_CHECK - Messages for check functions (company code merge) 
Message number: 249
Message text: Source value missing for (CoCd &1, new house bank &2)
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_20200_CHECK249 indicates that there is a missing source value for a specific company code (CoCd) and a new house bank in the context of a data migration or conversion process. This error typically arises during the execution of a conversion program, particularly when migrating financial data related to house banks.
Cause: The error is caused by the absence of a required source value in the migration data for the specified company code and house bank. This could happen due to several reasons: Incomplete Data: The source data may not have been fully populated or may be missing entries for the specified CoCd and house bank.
Configuration Issues: There may be configuration issues in the system that prevent the proper mapping of the source values to the target values. Data Mapping Errors: There could be errors in the mapping logic that fails to correctly associate the source values with the new house
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_20200_CHECK248 No cash journal business transaction mapping provided
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20200_CHECK247 Source CJ business transact. (CoCd &1, Tran.numb. &2) with missing target
What causes this issue?  Source cash journal business transaction (company code &V1&, transaction number &V2&) with missing target val...
CNV_20200_CHECK250 Source house bank (CoCd &1, house bank &2) does not exist
What causes this issue?  Source house bank (company code &V1&, house bank &V2&) does not exist in master data table T012. It is possib...
CNV_20200_CHECK251 All source house bank ID's exist
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.