Select statement

Hi gurus,

I have used following select statemenet and I ma getting this error, <b>The work area "IT_T158B" is not long enough .</b>can you please tell me what is the problem :

data : begin of it_t158b occurs 0,

tcode like t158b-tcode,

bwart like t158b-bwart,

end of it_t158b.

SELECT single * FROM T158B

into it_t158b WHERE TCODE = MIGO

AND BWART = 261.