Displaying all error messages in ME22n, ME21n

Hi Experts,

Below is my code. Here i am using mmpur_message_forced to display all the three error messages at the same time, i should not able to save the PO.

I tried using mmpur_message also. In that case, i can able to show only one Error message (the first error message it is encountered) and shows in the ME22n error log. how to display all the 3 error messages.

*  Checking for contract - payment term
            IF lwa_ekko-zterm IS NOT INITIAL AND
               lwa_ekko-zterm NE lwa_cekko-zterm.
              IF lwa_zspochk-ertyp = 'E'.
             mmpur_message_forced lc_e lc_msgid 061 lwa_cekko-zterm ' ' ' ' ' '.
             ELSEIF lwa_zspochk-ertyp = 'W'.
                mmpur_message_enaco lc_w
                                    lc_msgid      
                                    064
                                    lwa_cekko-zterm ' ' ' ' ' '.
              ENDIF.
              lv_check1 = 'X'.
            ELSEIF lwa_ekko-zterm = space.
            ENDIF.

*  Checking for contract - incoterm1
            IF lwa_ekko-inco1 IS NOT INITIAL AND
               lwa_ekko-inco1 NE lwa_cekko-inco1.
              IF lwa_zspochk-ertyp = 'E'.
               mmpur_message_forced lc_e lc_msgid 062  lwa_cekko-inco1 ' ' ' ' ' '.
              ELSEIF lwa_zspochk-ertyp = 'W'.
                mmpur_message_enaco lc_w
                                    lc_msgid      
                                    065
                                    lwa_cekko-inco1 ' ' ' '  ' ' .
              ENDIF.
              lv_check1 = 'X'.
            ELSEIF lwa_ekko-inco1 = space.
            ENDIF.

*  Checking for contract - incoterm2
            IF lwa_ekko-inco2 IS NOT INITIAL AND
               lwa_ekko-inco2 NE lwa_cekko-inco2.
              IF lwa_zspochk-ertyp = 'E'.
              mmpur_message_forced lc_e lc_msgid 063  lwa_cekko-inco2 ' ' ' '  ' '.
              ELSEIF lwa_zspochk-ertyp = 'W'.
                mmpur_message_enaco lc_w
                                    lc_msgid     
                                    066
                                    lwa_cekko-inco2 ' ' ' '  ' ' .
              ENDIF.
              lv_check1 = 'X'.
            ELSEIF lwa_ekko-inco2 = space.
            ENDIF.
            IF lv_check1 = 'X'.
              lv_check1 = ''.
              EXIT.
            ENDIF.