Dude, i think you might miss one detail, i add this part to complement your answer. When we are going to add the parameter in the window "Dataset Parameter" a new window comes, in that window we must select the parameter we want to made the relation with the main parameter of the main report, but we must dont forget below there another option "Parameter Expression", we need to add the parameter here to, is mandatory to make this works, so take this part very carefully, hope this can halp to another person.