Message type: E = Error
Message class:  CNV_LTHCM_S_10 - LT HCM: Message Class for Data Selection 
Message number: 031
Message text: In special selection &1 entries are excluded for other reasons
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_LTHCM_S_10031 typically occurs during data migration or conversion processes, particularly when using the SAP Landscape Transformation (SLT) or other data migration tools. This error indicates that certain entries have been excluded from the selection due to reasons other than the standard filtering criteria.
Cause: The error message suggests that there are specific entries in your dataset that are not being processed because they do not meet certain criteria or conditions defined in the migration program. This could be due to: Data Quality Issues: The entries may have missing or invalid data that prevents them from being processed. Business Logic Constraints: There may be business rules or logic defined in the migration program that exclude certain entries. Configuration Settings: The settings in the migration tool may be configured to exclude certain types of data. Dependencies: Some entries may depend on other entries that are not included in the selection.
Solution: To resolve this error, you
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_LTHCM_S_10030 In special selection &1 entries are included through search
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_LTHCM_S_10029 Information on special selection created or updated for &1 tables
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_LTHCM_S_10035 Search for HCM tables resulted in &1 new entries
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_LTHCM_S_10036 Table &1 added to list of HCM tables
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.