Display only error messages

Hi Guys,

What is the syntax for displaying only error messages for BAPIRET2_T

CALL FUNCTION 'xxxxxxxxx'

EXPORTING

..................

IMPORTING

ET_RETURN = itab_bapiret2_t.

LOOP AT itab_bapiret2_t

INTO wa_bapiret2_t.

WRITE :/ gw_bapiret2-MESSAGE. "This displays all the messages

ENDLOOP.

Thanks in Advance