Help needed - report on employees - start date when employment made permanent

Summary

How to create a report where I get data on dates when employees employment changed to permanent

Content

Hi,

I need a report from employees whose employment changed from temporary to permanent last year

I have created a report where I get data on employees with action reason "made permanent".

I took also the start date of the action into the report but that column gives the latest assignment change date, not the date when the action was done to change employment to permanent.

How do I get the correct date reflecting the date of the action "made permanent" to the report?