First of all dont even try to refer from anywhere regarding this issue because you will waste your time. Please only follow what I am mentioning in this. 1. First of all, all parameters that you send from the main report, have to be declared(and of the same type) in your sub dataset. 2. Select your chart or table and go to its dataset bar, you will find dataset run, parameters and parameter mapping. Select parameters on it. 3. Now add a paramter into the list for this you need to open the paramter option in expression edit and select the parameter from it which you created in Sub Dataset and whose name is same as the parameter name of main report input. 4. Now you have to mention the expression of the paramter for this again go to parameter option and select the paramter which you created in Sub Dataset and whose name is same as the parameter name of main report input. 5. Thats It your work is done.