Connection between 2 webdynpro inputfields

Question

i'm making a webdynpro with 2 inputfields of solution type and solutionsubtype.
this is the thing i want: when i select QM at the inputfield of the solution type then it is only possible to select solution subtypes that are only are available with the value QM.
and when i select at subtypes QM 01 that the type will be filled automaticly with QM.
could anybody help me with it

Answer 1

even with an OnEnter event it's possible and this is the coding:
  DATA lo_nd_input TYPE REF TO if_wd_context_node.
  DATA lo_el_input TYPE REF TO if_wd_context_element.
  DATA ls_input TYPE wd_this->element_input.
  lo_nd_input = wd_context->get_child_node( name = wd_this->wdctx_input ).
  lo_el_input = lo_nd_input->get_element(  ).
  lo_el_input->get_static_attributes(
    IMPORTING
      static_attributes = ls_input ).
  ls_input-field2 = ls_input-field1.   "copy the values
you can write your own logic to get the values for field2 based on the value in field1
  lo_el_input->set_static_attributes(
    EXPORTING
      static_attributes = ls_input ).
so my question is answerd.
thanks for all your replies