Enable screen field in WebDynpro ABAP

i,
I have WebDynpro ABAP screen where I have defined a read-only input field. Now I want to make this field input enable based on certain logic during run time.
CALL METHOD lo_el->set_attribute_property
    EXPORTING
      attribute_name = 'SP'
      property       = lo_el->e_property-read_only
      value          = ''.
I have written following code in method "WDDOMODIFYVIEW",
but somehow this is not working. Any Idea what is going wrong.
Regards,,,
Sunil Joyous

Manas,
You said,
You need to bind the read only poperty of input field with an attribute of type WDY_BOOLEAN, then based on your logic you can set the bound attribute to true or false in any method.
how do I do this ? Now I have done following
DATA : lv_wdy_boolean TYPE wdy_boolean.
lv_wdy_boolean = ''.
CALL METHOD lo_el->set_attribute_property
    EXPORTING
      attribute_name = 'SP'
      property       = lo_el_credit_note->e_property-read_only
      value          = lv_wdy_boolean.
but still it is not working.

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