Message type: E = Error
Message class:  LSO_CORRESPONDENCE - Correspondence Messages 
Message number: 012
Message text: Course or course type is blank
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The SAP error message LSO_CORRESPONDENCE012 indicates that there is an issue with the course or course type being blank in the context of Learning Solution (LSO) correspondence. This error typically arises when trying to create or process correspondence related to a course in the SAP Learning Solution module.
Cause: The error is caused by one of the following reasons: Missing Course Information: The course or course type has not been specified in the transaction or process you are trying to execute. Incorrect Configuration: The course or course type may not be properly configured in the system. Data Entry Error: There may be a mistake in the data entry where the course or course type field was left blank.
Solution: To resolve the error, you can take the following steps: Check Course Assignment: Ensure that the course or course type is correctly assigned in the relevant transaction. If you are creating correspondence, make sure to select a valid course or
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