Message type: E = Error
Message class:  CNV_20100 - Messageclass for chart of account conversion 
Message number: 640
Message text: Table COES does not contain any relevant entries
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_20100640 indicating that "Table COES does not contain any relevant entries" typically arises during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This error suggests that the system is attempting to access the COES table (which stores CO object entries) but finds no relevant data to process.
Cause: Missing Data: The COES table may not have been populated with the necessary data due to prior steps in the migration process not being executed correctly. Incorrect Configuration: The configuration settings for the migration might not be set up properly, leading to the system not being able to find the relevant entries. Data Selection Criteria: The selection criteria used to filter data for migration may be too restrictive, resulting in no entries being found. Data Transfer Issues: There may have been issues during the data transfer from the legacy system to the SAP
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_20100639 Table COES has no entries
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20100638 Secondary CostEl &2 also exists as G/L acct or secondary CostEl in CoA &3
What causes this issue?  The system initially found in phase 'Preprocessing programs BEFORE system lock that the chart of accounts conversion can...
CNV_20100641 Duplicate COES table key: &1 &2 &3 &4
What causes this issue?  Converting table COES would lead to following duplicate table keys: OBJNR, AWTYP               = &V1& AWKEY, AWSYS, A...
CNV_20100642 Duplicative COES keys 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.