Message type: E = Error
Message class:  HRTNM_LSO_MSG - Message class for LSO Integration 
Message number: 137
Message text: Action not possible: delete records from &2 for attendee &3 on course &4
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 HRTNM_LSO_MSG137 indicates that there is an issue with deleting records related to an attendee in a course within the Learning Solution (LSO) module. This error typically arises when there are constraints or dependencies preventing the deletion of the specified records.
Cause: Dependencies: The attendee may have completed certain activities or assessments that are linked to the course, making it impossible to delete their records. Status of the Course: The course might be in a status that does not allow for changes, such as being finalized or completed. Authorization Issues: The user attempting to delete the records may not have the necessary permissions to perform this action. Data Integrity Constraints: There may be data integrity rules in place that prevent the deletion of records if they are referenced elsewhere in the system.
Solution: Check Dependencies: Review the attendee's records to see if there are any completed activities or assessments that are preventing deletion. If
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
HRTNM_LSO_MSG030 TN &1 (&2): valuation not done, time recording must be positive
What causes this issue?  During the actual valuation of an ET (E-Learning) object, a check is being done on the "Time Recording Type" (field...
HRTNM_LSO_MSG029 TN &1 (&2): IT&3 update impossible, catalog obj. linked (&4) is not a D
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRTNM_LSO_MSG_UNS000 Message class for the LSO integration (unswitched package)
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRTNM_MSG000 Total of hours entered witin the grid (&1) must equal total duration (&2)
What causes this issue?  Number of hours entered in the various ALV grid lines are greater than training total duration.System Response  Error message...
Click on this link to search all SAP messages.