Message type: E = Error
Message class:  CNV_20200_CHECK - Messages for check functions (company code merge) 
Message number: 102
Message text: Company code &1 uses FI-SL Ledger &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_CHECK102 indicates that there is an issue related to the configuration of the Financial Accounting (FI) module, specifically concerning the use of Special Purpose Ledger (FI-SL) in relation to a company code. This error typically arises during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools.
Cause: The error message CNV_20200_CHECK102 is triggered when: The specified company code (&1) is configured to use a specific FI-SL ledger (&2), but there may be inconsistencies or misconfigurations in the settings. The ledger might not be properly assigned to the company code, or there could be issues with the ledger's configuration itself. The migration process is trying to access or utilize a ledger that is not correctly set up for the specified company code.
Solution: To resolve this error, you can follow these steps: Check Company Code Configuration: Go to the transaction code OBY6 (or use the appropriate navigation path) to
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_20200_CHECK101 Participating company codes use FI-SL with different settings
What causes this issue?  The participating company codes use FI-SL with different settings. The system identifies the following issues: The company co...
CNV_20200_CHECK100 Participating company codes use FI-SL with identical settings
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_CHECK103 Company code &1 uses FI-SL Ledger &2 with activity &3: Posting Indic. &4
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_CHECK104 FY variants with different posting periods of the current fiscal year
What causes this issue?  There are fiscal year variants that have different posting periods for the current fiscal year. The corresponding posting per...
Click on this link to search all SAP messages.