Message type: E = Error
Message class:  CNV20551 - message for package 20551 (company code delete) 
Message number: 027
Message text: CSKA-KTOPL=&1,KSTAR=&2,CSKB-KOKRS=&3 : will be deleted in CSKA!
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 CNV20551027 typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that there is an inconsistency or a conflict in the data related to the cost elements (KSTAR) and the controlling area (KOKRS) in the SAP system.
Cause: Data Inconsistency: The error suggests that there is a cost element (KSTAR) that is associated with a controlling area (KOKRS) that is not valid or does not exist in the target system. Deletion of Cost Elements: The message indicates that the cost element in the source system (CSKA) will be deleted because it does not have a corresponding entry in the target system.
Configuration Issues: There may be configuration issues in the controlling area or cost element settings that lead to this inconsistency.
Solution: Check Data Consistency: Verify the existence of the cost element (KSTAR) in the target controlling area (KOKRS). Ensure
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV20551026 Error while calling SUBMIT for report SAPF019
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20551025 Objects for deletion are written to table &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20551028 LGNUM=& is defined in T300; however assignment in T320 is missing
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20551029 VSTEL=& is defined in TVST, but missing in TVSTZ, TVSWZ and T001W
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.