Steve,
To eloborate little bit more on the above issue..
CALL METHOD cl_alv_table_create=>create_dynamic_table
EXPORTING
it_fieldcatalog = it_fldcat <<< this is of type LVC_T_FCAT which has a field DATATYPE of type CHAR 4 <<<<<
IMPORTING
ep_table = new_table.
So in the below code...
wa_it_fldcat-fieldname = 'field_style'.
wa_it_fldcat-datatype = 'lvc_t_styl'. <<<< this value is getting truncated to length 4
wa_it_fldcat-col_pos = index + 1.
APPEND wa_it_fldcat TO it_fldcat .
So property of field_style is not working properly..Hope i am clear in explaining the issue.. 