Report Fields disappearing after mapping parameter

Report is recreated from scratch after preview.

This how it was designed by fastreport.

That means  the all connections  queries are closed. What we had to do is to force it to reopen via code.  

This is extremely  annoying and I believe this issue was reported to fast report several years ago but it was never properly fixed.

Going trough the fastreport code and trying find the issue is very time consuming and it is preventing us for doing any development.
(Although it looks like minor issue)

We will leave as it is for now .
 

Thank you Mike, 

I really do appreciate the work you've put behind this . Hoping for a bug free December in Reporting