New Sample typ ref to Data not working

src/z2ui5_cl_demo_app_192.clas.abap

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+CLASS z2ui5_cl_demo_app_192 DEFINITION PUBLIC.
+
+  PUBLIC SECTION.
+    INTERFACES z2ui5_if_app.
+
+    DATA client TYPE REF TO z2ui5_if_client.
+
+    TYPES: BEGIN OF ty_s_key_value,
+             fname   TYPE char30,
+             value   TYPE string,
+             tabname TYPE char30,
+             comp    TYPE abap_componentdescr,
+           END OF ty_S_key_value,
+           ty_t_key_values TYPE STANDARD TABLE OF ty_s_key_value WITH EMPTY KEY.
+
+    TYPES: BEGIN OF ty_s_merged_Data,
+             t_kopf  TYPE REF TO data,
+             t_pos   TYPE REF TO data,
+             t_keyva TYPE ty_T_KEY_VALUEs,
+           END OF ty_S_merged_Data,
+           ty_t_merged_Data TYPE STANDARD TABLE OF ty_s_merged_Data WITH EMPTY KEY.
+
+    DATA mt_new_data TYPE ty_t_merged_data.
+
+    TYPES:
+      BEGIN OF ty_s_out,
+        aa TYPE string,
+        bb TYPE string,
+        cc TYPE string,
+      END OF ty_s_out,
+      ty_t_out TYPE STANDARD TABLE OF ty_s_out WITH EMPTY KEY.
+
+    DATA mt_out TYPE ty_t_out.
+
+    METHODS ui5_display.
+    METHODS ui5_event.
+
+  PROTECTED SECTION.
+    METHODS get_data.
+
+  PRIVATE SECTION.
+ENDCLASS.
+
+CLASS z2ui5_cl_demo_app_192 IMPLEMENTATION.
+
+  METHOD ui5_event.
+
+    CASE client->get( )-event.
+
+      WHEN 'BACK'.
+        client->nav_app_leave( client->get_app( client->get( )-s_draft-id_prev_app_stack ) ).
+
+    ENDCASE.
+
+  ENDMETHOD.
+
+  METHOD ui5_display.
+
+    DATA(view) = z2ui5_cl_xml_view=>factory( ).
+    view->shell(
+        )->page( title          = 'xxx'
+                 navbuttonpress = client->_event( val = 'BACK' )
+                 shownavbutton  = xsdbool( client->get( )-s_draft-id_prev_app_stack IS NOT INITIAL )
+            )->header_content( ).
+
+    client->view_display( view->stringify( ) ).
+
+  ENDMETHOD.
+
+  METHOD z2ui5_if_app~main.
+
+    me->client = client.
+
+    get_DATA( ).
+
+    ui5_display( ).
+
+  ENDMETHOD.
+
+  METHOD get_data.
+
+    mt_out = VALUE #( ( aa = 'aa' bb = 'bb' cc = 'cc'  )
+                      ( aa = 'a1' bb = 'b1' cc = 'c1'  ) ).
+
+    DATA(kopf) = REF #( mt_out ).
+
+    DATA lr_structdescr TYPE REF TO cl_abap_structdescr.
+    DATA lr_tabdescr    TYPE REF TO cl_abap_tabledescr.
+
+    FIELD-SYMBOLS <fs_s_head>     TYPE any.
+    FIELD-SYMBOLS <fs_t_head_new> TYPE STANDARD TABLE.
+    FIELD-SYMBOLS <fs_s_head_new> TYPE any.
+
+    LOOP AT kopf->* ASSIGNING <fs_s_head>.
+
+      APPEND INITIAL LINE TO mt_new_data ASSIGNING FIELD-SYMBOL(<fs_s_new_data>).
+
+      lr_structdescr ?= cl_abap_structdescr=>describe_by_data( <fs_s_head> ).
+      lr_tabdescr ?= cl_abap_tabledescr=>create( p_line_type = lr_structdescr ).
+
+      CREATE DATA <fs_s_new_data>-t_kopf TYPE HANDLE lr_tabdescr.
+      ASSIGN <fs_s_new_data>-t_kopf->* TO <fs_t_head_new>.
+
+      APPEND INITIAL LINE TO <fs_t_head_new> ASSIGNING <fs_s_head_new>.
+      <fs_s_head> = CORRESPONDING #( <fs_s_head_new> ).
+
+    ENDLOOP.
+
+  ENDMETHOD.
+
+ENDCLASS.

src/z2ui5_cl_demo_app_192.clas.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<abapGit version="v1.0.0" serializer="LCL_OBJECT_CLAS" serializer_version="v1.0.0">
+ <asx:abap xmlns:asx="http://www.sap.com/abapxml" version="1.0">
+  <asx:values>
+   <VSEOCLASS>
+    <CLSNAME>Z2UI5_CL_DEMO_APP_192</CLSNAME>
+    <LANGU>E</LANGU>
+    <DESCRIPT>App Calling App with REF</DESCRIPT>
+    <STATE>1</STATE>
+    <CLSCCINCL>X</CLSCCINCL>
+    <FIXPT>X</FIXPT>
+    <UNICODE>X</UNICODE>
+   </VSEOCLASS>
+  </asx:values>
+ </asx:abap>
+</abapGit>