STRU and exception tasks accepted; G6 cascade fix, exception class mutants, RTTI unit notes

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

tasks_gen/train/G1904/spec.md

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+# 1. Goal
+A stock issue program must stop with a clear reason when it cannot issue a
+quantity of a material. The caller needs one exception class that carries the
+reason and the data of the failed issue.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- The interface {{P}}IF_ISSUE_ERROR_INFO exists in package $TMP. It is active.
+- The interface has the type TY_CASE (CHAR 20) and the methods GET_CASE,
+  GET_MATERIAL, GET_QUANTITY and GET_LIMIT.
+- The exception class {{P}}CX_ISSUE_ERROR is raised by the stock issue program
+  and caught by the caller.
+
+# 4. Contract
+- Create the class {{P}}CX_ISSUE_ERROR in package $TMP.
+- The class inherits from CX_STATIC_CHECK.
+- The class is public, final, and has a public constructor.
+- The class implements {{P}}IF_ISSUE_ERROR_INFO.
+- The class has the constant structure C_CASE. Its components are
+  UNKNOWN_MATERIAL, ZERO_QUANTITY and OVER_LIMIT. The type of each component is
+  {{P}}IF_ISSUE_ERROR_INFO=>TY_CASE. The value of each component is its name.
+- The constructor has these importing parameters, in this order:
+  IV_CASE (type {{P}}IF_ISSUE_ERROR_INFO=>TY_CASE), IV_MATERIAL (type STRING),
+  IV_QUANTITY (type I), IV_LIMIT (type I).
+- The class redefines the inherited method GET_TEXT. GET_TEXT has no importing
+  parameter and returns the text as a string.
+- Do not add other public methods.
+
+# 5. Business rules
+1. The constructor stores IV_CASE, IV_MATERIAL, IV_QUANTITY and IV_LIMIT.
+2. {{P}}IF_ISSUE_ERROR_INFO~GET_CASE returns the stored case, ~GET_MATERIAL the
+   stored material, ~GET_QUANTITY the stored quantity and ~GET_LIMIT the stored
+   limit.
+3. GET_TEXT returns one text that depends on the stored case:
+   - C_CASE-UNKNOWN_MATERIAL: 'Material <material> is not known'
+   - C_CASE-ZERO_QUANTITY: 'Quantity must not be zero for material <material>'
+   - C_CASE-OVER_LIMIT: 'Quantity <quantity> exceeds limit <limit> for material
+     <material>'
+   - any other case, including an empty case: 'Stock issue failed for material
+     <material>'
+   <material>, <quantity> and <limit> are the stored values. Write the quantity
+   and the limit as plain digits, for example 120 and 100. The text has no
+   leading and no trailing blanks.
+4. The class is a static check exception. A caller must handle it or declare it
+   in the RAISING clause.
+
+# 6. Constraints
+- Release target: SAP_BASIS 816.
+- Coding standards: Clean ABAP. Method length below 40 statements. No global
+  variables. No comment that restates the code.
+- Out of scope: do not change {{P}}IF_ISSUE_ERROR_INFO.
+
+# 7. Acceptance
+- The class is active and has no syntax error.
+- The hidden tests pass.
+- Write your own ABAP Unit tests for the class.