Message type: E = Error
Message class:  CNV_20100 - Messageclass for chart of account conversion 
Message number: 527
Message text: Uploaded data &1 &2 differs from current critical merge data, no update
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_20100527 indicates that there is a discrepancy between the uploaded data and the current critical merge data during a data migration or conversion process. This error typically occurs in the context of SAP's data migration tools, particularly when using the SAP S/4HANA Migration Cockpit or similar tools.
Cause: The error arises when the data being uploaded does not match the expected format or values in the target system. This can happen due to several reasons: Data Integrity Issues: The uploaded data may have been altered or corrupted, leading to inconsistencies. Version Mismatch: The data being uploaded may be from a different version or configuration than what the target system expects. Missing Dependencies: The uploaded data may rely on other data that is not present or has been modified in the target system. Validation Rules: The data may not meet the validation rules defined in the target system, leading to rejection.
Solution: To resolve this
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_20100526 Country-specific G/L account fields will be filled for company code &3
What causes this issue?  No name was specified for the new country-specific chart of accounts in the mapping entry &V1& -> &V2&. Th...
CNV_20100525 Country-specific conversion: No company code information available
What causes this issue?  The alternative account number &V1& in a company code is to be converted, however no company code information is avai...
CNV_20100528 Uploaded data &1 &2 &3 &4 differs from current data
What causes this issue?  Downloaded data (old chart of accounts, new chart of accounts, old account, new account) was changed before upload.System Res...
CNV_20100529 Download completed
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.