ClientDataSet1 > DataSetProvider1 > SqlDataSet1> sql = select * from customer
i add all fields at design time
than i copy the ClientDataSet1 rename it to ClientDataSet2
On DataModule create event i clone the cursor
so the cloned dataset has now all persistence fields defined in cds1
according to the answer in this question
i attempted to add extra field InternalCalc/LookupField to the cloned dataset
at design time but error occurred during the execution "Field not Found"
My question what is the correct way to add extra field that doesn't exist in
the master dataset nor in the database to a cloned TClientDataSet.