Error in code inspector

Hi,

I am getting below error in code inspector

No first field of a table index in WHERE condition

for the blow select query

SELECT hkont gjahr projk monat SUM( wrbtr )
FROM bsis
INTO TABLE it_bsis
WHERE hkont IN v_hk AND gjahr = p_fiscal AND monat = p_post
AND projk = p_wbs
GROUP BY hkont gjahr projk monat wrbtr.

I made changes in the above query, but the error still persists