agregate functions and error handling

Hi all,

 

is it possible in rlib to use agregate functions (sum, avg,min,max) on
fieldbreaks?

Or an additional query on break ?

I haven't found it in manual. 

 

Second. Is it possible in rlib to handle errors without programm
crasches? 

I try to use it in server environment and it ist not good, when server
crasches on report error.

 

 

Sincerely,

Leo Seib