Message type: E = Error
Message class:  CNV_20000 - Messages for fiscal year change 
Message number: 007
Message text: &1 BSEG records with ZUONR found
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_20000007 typically relates to issues encountered during data migration or conversion processes, particularly when dealing with financial documents. The message indicates that there are BSEG (Accounting Document Segment) records that contain a ZUONR (Assignment Number) field, which may not be expected or valid in the context of the operation being performed.
Cause: Data Migration Issues: The error often arises during data migration processes, where legacy data is being transferred into the SAP system. If the legacy data contains assignment numbers that do not conform to the expected format or rules in the target system, this error can occur. Inconsistent Data: The presence of unexpected or inconsistent data in the BSEG table can trigger this error. This might happen if the data was not properly cleaned or validated before migration.
Configuration Issues: There may be configuration settings in the SAP system that do not align with the data being imported, leading
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_20000006 Company codes not present in the system
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20000005 No change of document numbers required: &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20000008 &1 BSEG records with ZUONR for conversion found
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20000009 &
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.