Group Totals not using Project Default Calendar

Hi

I am using Pimavea P6 Release 8.2 

I would like to know how to change the calendar used at the Group Totals. (Summarised to Project Level) 

Initially it uses Project Default Calendar as shown in the Calenda.....But on changing the default calendar it does not resummaise and does not give me resummarised date based on the default calendar.

(well actually Im working on a template from a previous poject and that has 7 days woking set as the project default calemdar,,, where as I want it in 6 days working+holidays at the project level....How can I do this??)