Message type: E = Error
Message class:  CNV_10940_MSG - Message Class for Report Variant Scan 
Message number: 031
Message text: Unable to create tree
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_10940_MSG031: Unable to create tree typically occurs during data migration or conversion processes, particularly when using the SAP Landscape Transformation (SLT) or SAP Data Services. This error indicates that the system is unable to create a hierarchical structure (tree) for the data being processed. Causes: Data Structure Issues: The data being processed may not conform to the expected structure, leading to difficulties in creating the tree. Configuration Problems: Incorrect configuration settings in the migration or transformation tools can lead to this error. Missing Data: Required data elements or relationships may be missing, preventing the tree from being constructed. Performance Issues: If the system is under heavy load or if there are performance bottlenecks, it may fail to create the tree. Authorization Issues: Lack of necessary authorizations for the user executing the migration can also lead to this error. Solutions: Check Data Structure: Review the data being processed to ensure it meets the expected structure
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_10940_MSG030 Report &1 variant &2 use value of variable &4 from table TVARVC
What causes this issue?  Report &V1& variant &V2& using constant variable &V4& from table TVARVC. The system issues an error m...
CNV_10940_MSG029 Report variant(s) using constant variables from table TVARVC
What causes this issue?  Report variants using constant variables from table TVARVCSystem Response  These constant variables stored in table TVARVC ca...
CNV_10940_MSG032 Error while displaying project overview document
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10940_MSG033 Node not found
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.