Message type: E = Error
Message class:  CNV_DMC_WDA - Messages used in WDA UI 
Message number: 137
Message text: The system is currently generating the delta file, please refresh later
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_DMC_WDA137 indicates that the system is in the process of generating a delta file, which is a part of the data migration process in SAP systems, particularly when using the Data Migration Cockpit (DMC) or similar tools. This message typically occurs when a user attempts to access or refresh data while the system is still processing the delta file.
Cause: Ongoing Delta File Generation: The primary cause of this error is that the system is currently busy generating a delta file, which is necessary for tracking changes in data during the migration process. Concurrency Issues: Multiple users or processes trying to access the same data or perform operations simultaneously can lead to this error. Long Processing Time: If the delta file generation takes longer than expected due to a large volume of data or system performance issues, users may encounter this message.
Solution: Wait and Refresh: The simplest solution is to wait
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_DMC_WDA136 Action not possible; choose ôRestart Transferö button to restart transfer
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_DMC_WDA135 Error while generating runtime objects
What causes this issue?  An error occurred while generating the runtime object. The relevant runtime object is outdated.System Response  The system is...
CNV_DMC_WDA138 The visibility of one or more fields in the view has changed
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_DMC_WDA139 Cannot open migration object; refresh this web page and try again
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.