Column position of a CL_WD_TABLE (not ALV)

Hi all experts,

got a task that is driving me crazy... 

I had to add a cellVariant management on a column of a standard table in SRM 7. In order to avoid any modification to the standard, I preferred to create a new, custom column.

This new, custom column (made via Enhancement) is done as follows:

while the original, standard one is done as follows:

As you can see, in the standard column, the field PRODUCT_ID could only be an inputField, while in my custom column the field could be an InputField or a Dropdown element, depending on CellVariant key.

Now... what is driving me crazy is columns order.

I used to modify columns order from Component Configuration, but actually, when clicking on Re-Sort for the table, the ONLY entry I see is my custom column (ORDERED_PROD_CUST).

I then opened the standard WD Component for modification and right-clicked on the TABLE node in Layout, selecting Convert Table Columns, hoping this would do the trick  (as in other situations did). This resulted in a runtime dump caused by an Assertion failed... So I had to revert the WD Component to standard (restoring the first version) and... here I am.

I'm actually trying to approach the task from the ABAP perspective, but there are no explicit methods to re-arrange column's position in a CL_WD_TABLE.

Moreover, I found in debug that my custom column is a GROUPED_COLUMN while standard ones are just COLUMNS.

I tried then to do as follows in WDDOMODIFYVIEW:

if first_time eQ abap_true.

* get table reference

     table ?= view->get_element( 'ITEMS_TABLE' ).

* remove standard column

     CALL METHOD TABLE->REMOVE_COLUMN

       EXPORTING

         ID         = 'ORDERED_PROD'

*       INDEX      =

       RECEIVING

         THE_COLUMN = col.

* remove custom column and re-add it
* because the ADD_GROUPED_COLUMN has an INDEX parameter
* that could be used to specify column's position

     CALL METHOD TABLE->REMOVE_GROUPED_COLUMN

       EXPORTING

         ID                 = 'ORDERED_PROD_CUST'

*       INDEX              =

       RECEIVING

         THE_GROUPED_COLUMN = grcol.

     CALL METHOD TABLE->ADD_GROUPED_COLUMN

       EXPORTING

         INDEX              = 3

         THE_GROUPED_COLUMN = grcol.

   endif.

But again, this doesn't seem to work.

Any idea will be appreciated

Matteo