Hi Manuel,
Thank you for your purchase.

Can you send me the link so I can take a look.
Thank you.

Hi Manuel,

We are currently investigating your issue I will let you know as soon as we found the solution.
Thank you for understanding.

Hi Manuel,

Sorry to disappoint you but unfortunately Sum is added dynamically and it can be displayed just on page
It can not be rendered and visible when you click on the buttons ( PDF, CSV, Excel...)

Hi Manuel

Unfortunately no.
You can find all actions and filters in our documentation but there is no hook to add sum in export data tool.
This feature is not easy as it looks and i will forward your request to our lead developer and maybe in future we will implement it.

Hi Manuel,

Can you please tell me precisely which tool do you use to read the exported data?
Thank you. 

Hi Manuel,

In file ../wpdatatables/source/class.float.wpdatacolumn.php around line 25 you will find this line of code

if($number_format == 1){
   $formattedValue = number_format( 
                                          (float) $content, 
                                          $decimal_places, 
                                          ',', 
                                          $this->thousandsSeparatorVisible() ? '.' : ''
                                      );
}else{
   $formattedValue = number_format(
                                          (float) $content, 
                                          $decimal_places,
                                          '.', 
                                          $this->thousandsSeparatorVisible() ? ',' : ''
                                          );
}

We are using datatables library for front end and I think that the issue is in thousand separator.
Can you please try to remove this line of code and try after that.

HI Manuel,

Good job,we are glad that you found the solution.
If you have any issues feel free to open a new ticket.