Not able to give any input after error mesages

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hi facing one issue after error your screen not able to give any input for this purpose we have to write below code


 IF  xvttp-lgort IS INITIAL.
    MESSAGE I000(messagesclass) WITH  c_xvttp-tpnum DISPLAY LIKE 'E'.
    SET SCREEN SY-dynnr.
        LEAVE SCREEN.
  ENDIF.

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