Here is an example of using the constraints from a DD to do manual constrained finds

you can add this code to the order entry example

        Procedure OnPostFind Integer eMessage Boolean bFound
            Forward Send OnPostFind eMessage bFound
            Constraint_Set 99
            Constraint_Set 99 Clear
            Send Constrain to orderdtl_DD
            Number nTotal
            Constrained_Find First orderdtl by 1
            While (Found)
                Move (nTotal+OrderDtl.Extended_Price) to nTotal
                Constrained_Find Next            

            Constraint_Set 99 Delete
            Set Value of oTotalManual to nTotal
this way you dont have to code your selections twice once in the constraints and once for the manual finds