Error message issue in webUI

Hi all,

I am displaying the error message in webui using below code  in Opportunity screen  in DO_VALIDATE_INPUT method.

   lr_msg_srv = cl_bsp_wd_message_service=>get_instance( ).

       lr_msg_srv->add_message( iv_msg_type = lc_e

                                          iv_msg_id = 'AM'

                                          iv_msg_number = '001'

                                          iv_msg_v1 = TEXT-001

                                       iv_msg_v2 = TEXT-002 ).

But when I go back to Home screen in webUI or click on Back button    with out saving the transaction , still the error message is appearing in WebUi Home screen.

when I am doing some action then only that error message getting vanish.

Please help in this

regards,

rama