Dynamic Table Creation using RTTS - Question on Issue

Question

I am using the RTTS services to dynamically create a table.  However, when I attempt to use the get_components method it does not return all the components for all tables that I am working with.
Cases and End Results
1) Created structure in data dictionary – get_components works.
2) Pass PA0001, P0001 or T001P to get_components and I do not receive the correct results.  It only returns a small subset of these objects.  The components table has all the entries; however, the get_components method only returns about 4 rows.
Can you explain this and point me to the correct logic sequence? I would like the logic to work with all tables.
Code excerpt below:
The logic for the get components works for case 1, but not case 2. When I pass into this method a "Z" custom table or structure name for parameter “structure_name” and the get_components() method executes and returns the correct results. However, when I pass in any of the objects listed above in case 2, the get_components method does not return the correct number of entries. When I check typ_struct which is populated right before the get_components line, I see the correct number of components in the components table. 
method pb_add_column_headings .
  constants: c_generic_struct type c length 19 value 'ZXX_COLUMN_HEADINGS'.
  data: cnt_lines      type sytabix,
        rf_data        type ref to data,
        typ_field      type ref to cl_abap_datadescr,
        typ_struct     type ref to cl_abap_structdescr,
        typ_table      type ref to cl_abap_tabledescr.
  data: wa_col_headings type ddobjname.
  data: rf_tbl_creation_exception type ref to 
                                  cx_sy_table_creation,
        rf_struct_creation_exception type ref to
                                  cx_sy_struct_creation.
  data: t_comp_tab type
                   cl_abap_structdescr=>component_table,
        t_comp_tab_new      like t_comp_tab,
        t_comp_tab_imported like t_comp_tab.
  field-symbols: <fs_comp> like line of t_comp_tab,
                 <fs_col_headings_tbl> type any table.
**Get components of generic structure
  wa_col_headings = c_generic_struct.
  typ_struct ?= cl_abap_typedescr=>describe_by_name(
                                   wa_col_headings ).
  T_COMP_TAB = typ_struct->get_components( ).
**Determine how many components in imported structure.
  typ_struct ?= cl_abap_typedescr=>describe_by_name(
                                    structure_name ).
  t_comp_tab_imported = typ_struct->get_components( ).
  cnt_lines = lines( t_comp_tab_imported[] ).

Answer 1

Hi Garton,
1. GET_COMPONENT_LIST
   Use this FM.
   It gives all fieldnames.
2. Use this code (just copy paste)
REPORT abc.
DATA : cmp LIKE TABLE OF rstrucinfo WITH HEADER LINE.
DATA : pa0001 LIKE TABLE OF pa0001 WITH HEADER LINE.
CALL FUNCTION 'GET_COMPONENT_LIST'
  EXPORTING
    program    = sy-repid
    fieldname  = 'PA0001'
  TABLES
    components = cmp.
LOOP AT cmp.
  WRITE :/ cmp-compname.
ENDLOOP.
regards,
amit m.