Object type mix: INTF, TABL, STRU, MSAG, exception tasks (harness G2, mutants, generator notes), balanced generator, kind-deficit job order, dashboard mix card

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tasks_gen/train/G1902/spec.md

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+# 1. Goal
+
+Create the message class and the class-based exception for the training course
+booking service. The booking service reports every problem with a message from
+the message class. The exception class carries the text of such a message.
+
+# 2. Open questions
+
+None.
+
+# 3. Context
+
+- All objects are in package $TMP.
+- The booking service books participants into training courses.
+- The old exception class {{P}}CX_LEGACY exists. It takes a hard-coded text and
+  does not use a message class. The new exception class replaces it.
+- All texts of the booking service come from one message class.
+
+# 4. Contract
+
+- Create the message class {{P}}MSG with the messages of section 5.
+- Create the exception class {{P}}CX_BOOKING:
+  - It is a class-based exception and inherits from CX_STATIC_CHECK.
+  - The constructor has these parameters:
+    - iv_msgno TYPE symsgno
+    - iv_arg1 TYPE string, default ''
+    - iv_arg2 TYPE string, default ''
+  - The method GET_TEXT of the interface IF_MESSAGE returns the text of the
+    message with the number iv_msgno from {{P}}MSG. The placeholder &1 is
+    replaced by iv_arg1 and the placeholder &2 is replaced by iv_arg2.
+
+# 5. Business rules
+
+Message class {{P}}MSG:
+
+1. Message 001, error message, text "Course &1 is fully booked". The booking
+   service uses it when a course has no free seat.
+2. Message 002, error message, text "Participant &1 is already booked for
+   course &2". The booking service uses it for a double booking.
+3. Message 003, warning message, text "Course &1 has only &2 free seats left".
+   The booking service uses it when a course has few free seats left.
+4. Message 004, information message, text "Booking for course &1 is
+   confirmed". The booking service uses it for a successful booking.
+5. Message 005, warning message, text "Course &1 was cancelled on &2". The
+   booking service uses it for a cancelled course.
+
+Exception class {{P}}CX_BOOKING:
+
+6. The constructor stores the message number and the two placeholders.
+7. GET_TEXT returns the text of the message with the number iv_msgno from
+   {{P}}MSG. The placeholder &1 is replaced by iv_arg1 and the placeholder &2 is
+   replaced by iv_arg2.
+
+# 6. Constraints
+
+- Release target: SAP_BASIS 816 (ABAP Platform 2025).
+- Coding standards: Clean ABAP. Keep every method below 40 statements. Do not
+  produce ATC findings of priority 1 or 2.
+- Out of scope: database tables, CDS views, reports, dynpro, and the old
+  exception class {{P}}CX_LEGACY.
+
+# 7. Acceptance
+
+- The message class {{P}}MSG is active. It contains the messages 001 to 005 with
+  the exact texts of section 5.
+- The exception class {{P}}CX_BOOKING is active and has no syntax error.
+- The hidden tests pass.
+- Write ABAP Unit tests for the messages and the exception class in a global
+  test class.