Hi again ,
I cant find any solution for my problem , it's driven me mad
I make a simple DataSet which includes 3 tables(1.Student,2.Mark,3.Lesson) ,
I have used studdent's table in my main report and Mark and Lesson into my subreport , student's table has relation with mark's table and mark's table has a relation with lesson also .
as i use just one filed from lesson i got a exception ,
i don't know why this happen , because I had used it many times in Crystal report 8 .what is the difference between two crystal report 8 and crystal report 12

?
please please help me ,
Edited by nahalrazeghi - 08 Sep 2012 at 5:12am