Message type: E = Error
Message class:  HRPIQ00REGIST - Messages Related to Registration 
Message number: 016
Message text: Activity &1 is not allowed; student is already registered for &2
You have attempted to perform activity &V1&.
The student is already registered for program &V2&. An open study
segment therefore already exists in the system.
The system allows you to enter a program with activity &V1& only if
there is no open study segment.
Check the registration data stored in the system.
Close the existing study segment by performing a de-registration
activity, and then perform activity &V1&.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message HRPIQ00REGIST016 indicates that a student is attempting to register for a specific activity (course, event, etc.) but is already registered for another activity that conflicts with the registration process. This is a common issue in systems that manage educational or training programs, where overlapping registrations are not permitted.
Cause: Conflicting Registrations: The student is already registered for another activity that overlaps with the new registration they are trying to complete. System Configuration: The system may be configured to prevent multiple registrations for certain types of activities or courses. Incorrect Data Entry: There may be an error in the data entry process, such as selecting the wrong student or activity.
Solution: Check Current Registrations: Review the student's current registrations to identify any conflicts. This can usually be done through the student management or registration module in SAP. Modify or Cancel Existing Registration: If the student needs to register for the new activity, consider modifying
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HRPIQ00REGIST015 Activity &1 is not allowed; there is no open study segment for &2
What causes this issue?  You have attempted to perform activity &V1&. This is not allowed because the student has no open study segment; this ...
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