I have Account as parent object. Campaigne and Candidate objects are child objects of (lookup) Account Objects. in Candidate Objects I have 3 fields first name, Last Name, Age fields. when i am treying to save Campagine record if it shoud check related candidate fields(first name, Last Name, Age) should not bank. if blank upon saveing Campagine records it should display error message that 'first name, Last Name, Age' fileds should not blank. it should work if any of candidate field is blank also...

kindly suggest me....