Message type: E = Error
Message class:  CNV_20100 - Messageclass for chart of account conversion 
Message number: 380
Message text: G/L accounts and/or cost elements in chart of accounts &1 are modified
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_20100380 indicates that there are modifications to General Ledger (G/L) accounts and/or cost elements in the specified chart of accounts. This error typically arises during data migration or conversion processes, particularly when using SAP's Migration Cockpit or during system upgrades.
Cause: Data Consistency Issues: The error usually occurs when there are inconsistencies in the data being migrated, such as changes made to G/L accounts or cost elements after the initial data extraction. Modification of Master Data: If G/L accounts or cost elements have been modified in the source system after the migration process has started, it can lead to this error. Configuration Changes: Changes in the configuration of the chart of accounts or related settings can also trigger this error.
Solution: Check for Modifications: Review the G/L accounts and cost elements in the specified chart of accounts to identify any modifications that may have occurred. This can be done by comparing the
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_20100379 ACCOUNT_CONVERT_20100 does not convert numerals without leading zeros
What causes this issue?  At least one numeral without leading zeros was found (e.g. &V1&). Routine ACCOUNT_CONVERT_20100 does not convert nume...
CNV_20100378 __no copy of chart of accounts
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20100381 &1: maximum number of records was reached; analysis is stopped
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20100382 &1: table field is always blank
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.