Message type: E = Error
Message class:  CNV20305 - Messages for conversion packages in CO 
Message number: 720
Message text: &1 entries generated
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 CNV20305720 typically relates to issues encountered during data migration or conversion processes, particularly when using SAP's tools for data migration, such as the SAP S/4HANA Migration Cockpit or other data transfer tools. The message indicates that a certain number of entries (denoted by &1) were generated, which may not have been processed correctly or may require further attention.
Cause: Data Inconsistencies: The error may arise due to inconsistencies in the source data that do not meet the required format or validation rules in the target system. Mapping Issues: There may be issues with the mapping of fields between the source and target systems, leading to incorrect or incomplete data entries. Configuration Errors: Incorrect configuration settings in the migration tool or the target system can lead to errors during the data transfer process. Missing Dependencies: Certain required data or dependencies may be missing, causing the migration process to fail for specific entries.
Solution: Review
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV20305719 &1 entries generated, &2 entries modified
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20305718 No space left to add an pre- or suffix
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20305721 &1 entries modified
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20308000 &1 &2 &3 &4
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.