Message type: E = Error
Message class:  CNV_LTHCM_S_10 - LT HCM: Message Class for Data Selection 
Message number: 155
Message text: Specify an HCM table (table group &1)
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_10155 indicates that a specific HCM (Human Capital Management) table needs to be specified, and it is related to the data migration process in SAP systems, particularly when using the SAP Landscape Transformation (SLT) or other data migration tools.
Cause: This error typically occurs during the data migration process when the system expects a specific HCM table to be defined or selected, but it is either missing or not specified correctly. This can happen due to: Incorrect Configuration: The configuration for the data migration might not have the required HCM table specified. Missing Table Group: The table group referenced in the error message might not be properly defined or does not exist in the system. Data Migration Settings: The settings for the data migration process may not include the necessary HCM tables.
Solution: To resolve this error, you can take the following steps: Check Table Group Configuration: Go to the relevant configuration settings in your
 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_10154 &1 tables excluded for other reasons
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_10153 &1 tables 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_10156 For table &1 do not specify standard table group &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_LTHCM_S_10157 Table &1 may be relevant for special selection
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.