Regarding crystal report basic 2008

Dear sir,

i had created two commands in crystal report and retrieving data using where conditions in select query .

and after that i also clear all link between two commands but still it takes the link automatically and i am not able to get my real data..

If i use only one command then it gives me perfect data but when there is use of both commands to gather it doesnt give my expected result ....duplicate data is generated automatically..

Please provide solution of this .

Thanks

Parag