In my project(Project A) i have one custom field i.e custom field1 ( type check box) this check box only will enable based on the other two custom field values i.e custom field2 (type drop down) and custom field3 (type drop down). custom field2 values (none,A,B,C,D) and custom field3 values( none, E,F,G,H) custom field1 only enable except the values custom field2(none) and custom field3(none).