Update

src/zcx_demo_abap_error_b.clas.abap

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+CLASS zcx_demo_abap_error_b DEFINITION
+  PUBLIC
+  INHERITING FROM cx_static_check
+  FINAL
+  CREATE PUBLIC .
+
+  PUBLIC SECTION.
+
+    INTERFACES if_t100_message.
+    INTERFACES if_t100_dyn_msg.
+
+    METHODS constructor
+      IMPORTING
+        textid   LIKE if_t100_message=>t100key OPTIONAL
+        previous LIKE previous OPTIONAL.
+  PROTECTED SECTION.
+  PRIVATE SECTION.
+ENDCLASS.
+
+
+
+CLASS zcx_demo_abap_error_b IMPLEMENTATION.
+  METHOD constructor ##ADT_SUPPRESS_GENERATION.
+    super->constructor( previous = previous ).
+
+    CLEAR me->textid.
+    IF textid IS INITIAL.
+      if_t100_message~t100key = if_t100_message=>default_textid.
+    ELSE.
+      if_t100_message~t100key = textid.
+    ENDIF.
+  ENDMETHOD.
+ENDCLASS.