Template report : initialDueDate and ActualDueDate not set for linked activities

Hello,

i use template report to show projet and linked activities (using linked element to get activities).
In my project, i link 2 activities (#3 and #4) link here :
 

Each activity is planned as visible here :
 

I use template report (see attachement) to get project data and linked activities datas (i use every fileds for activity in my test template).
 

While generating report, i get no data for initialDueDate and ActualDueDate for activities (see attachement).
 

Any idea ?

Best regards,