Message type: E = Error
Message class:  CNV_00001 - Message class for CWB settings maintenance programs 
Message number: 580
Message text: The system needs to prepare some data; choose Ok to continue
In order to start this activity, the system needs to load and process
large amounts of data. This may take some time.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Choose Ok, and wait for the system to display the screen.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_00001580 typically occurs during data migration or conversion processes, particularly when using the SAP Landscape Transformation (SLT) or SAP Data Services. This message indicates that the system requires additional time to prepare or process data before proceeding with the operation you are attempting.
Cause: Data Preparation: The system is in the process of preparing data for migration or transformation. This can happen if there are large volumes of data or if the data needs to be validated or transformed before it can be processed. System Load: High system load or performance issues can also trigger this message, as the system may need to allocate more resources to handle the data preparation.
Configuration Issues: There may be configuration settings that need to be adjusted to optimize data processing.
Solution: Choose "OK": If you see this message, simply clicking "OK" will allow the system to continue with the data preparation process. This is often
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_00001570 No table selected; action cancelled.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_00001561 No data selected
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_00001601 Choose a valid routine.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_00001602 No suitable conversion routine was found for field &2 of 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...
Click on this link to search all SAP messages.