Message type: E = Error
Message class:  CNV_PE - General messages for posting engine 
Message number: 013
Message text: Changed objects exist, which are not yet saved
At least one object exists that is not yet saved.
<ZH>Additional information</>
Object ID,,<ZH>&V1&</>
Object name,,<ZH>&V2&</>
Object type,,<ZH>&V3&</>
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_PE013 indicates that there are changed objects in the system that have not yet been saved. This typically occurs during a data migration or conversion process, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools.
Cause: Unsaved Changes: The most common cause of this error is that there are changes made to objects (like tables, structures, or configurations) that have not been saved in the system. This can happen if you are working in a transaction and have not yet saved your changes. Inconsistent State: The system may be in an inconsistent state due to unsaved changes, which can lead to issues during the migration process. User Session: If multiple users are working on the same objects, one user may have made changes that are not yet saved, causing this error for others.
Solution: Save Changes: Ensure that all changes made to the objects are saved. You can
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_PE012 Status ID &1 unknown for object type &2 with status type &3
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_PE011 Error &1 in module &2
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_PE014 Area &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_PE015 Worklist object not found for area &1
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.