interactive report

Hello friends,

I am writing a interactive report and am using at first,

i am writing a perform statement with in a loop...endloop. and i am using my at first in the perform statement.

It comes with an error saying that at first should be within a loop ...endloop.

LOOP AT IT_OUT.

PERFORM REPORT_OUTPUT.

ENDLOOP.

FORM REPORT_OUTPUT .

MOVE IT_OUT TO WA_OUT.

AT FIRST.

FORMAT COLOR 5 ON.

WRITE:/1 'Invoice #',15 'Principal #',30 'SAP Customer #',

40 'Customer Name',65 'Material #', 80 'Quantity',

100'Net Amount', 120'Promo / Non-Promo'.

FORMAT COLOR 5 OFF.

SKIP 1.

ENDAT.

ENDFORM. " F2010_WRITE_REPORT_OUTPUT

aNY SUGGESTIONS.