Multiple filter in Crystal Report's record selection forumla editor

Hi All,

I am trying to filter record in crystal report on the basis of three sql table column values like :-

(not isnull({Table.IN_DATE}) or {Table.flag}='Y' or {Table.BOOK_CODE}='06') AND {Table.GRPS} = "22"

now report should display records if table in_date is not null or flag=Y or book_code=06 and GRPS=22 but report considering only in_date filter,     

for e.g. if in_date is null and flag = Y or book_code is 06 then report should display same record but it is displaying on records whose in_date is not null.

Pls tell me where i am doing wrong. i will be very thakful to you...