Message type: E = Error
Message class:  CNV20551 - message for package 20551 (company code delete) 
Message number: 439
Message text: Object type &1: Table field &2 does not exist in DDIC
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 CNV20551439 indicates that there is an issue related to a specific object type and table field that does not exist in the Data Dictionary (DDIC). This error typically arises during data migration or conversion processes, particularly when using SAP's tools for data transfer or transformation.
Cause: Field Deletion: The field specified in the error message may have been deleted from the Data Dictionary in the current version of the system. Incorrect Mapping: There may be an incorrect mapping in the data migration process, where the source field does not correspond to a valid field in the target system. Version Mismatch: The source system may be using a different version of the data model, leading to discrepancies in field availability. Custom Development: If the field is part of a custom development or enhancement, it may not be present in the target system.
Solution: Check Data Dictionary: Verify if the specified table field exists in
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV20551438 Object type &1, OBART=&2: Table field &3 does not exist in DDIC
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20551437 Object type &1: Determination table &2 does not exist in DDIC
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20551440 (Kokrs=&1,PrCtr=&2) suggested for deletion; CoAr will not be deleted
What causes this issue?  Profit center (PRCTR) &V2& belongs to controlling area &V1&, which will be partly deleted. All company codes ...
CNV20551441 &1 with key fld &2 (domain &3) excluded from deletion; see long text (&4)
What causes this issue?  The table with the personnel number in its key is excluded from the standard deletion process. The system suggests that this ...
Click on this link to search all SAP messages.