Edit milestones within a project

I want to edit a milestone within a project, like this

To do this I have this action:
Custom API request POST
Full url: https://hera.flowlu.com/api/v1/module/st/stage_checkitems/update/27
JSON: {"report" : "BTW bedraagt 674 Fiscus 2021-07-13" , "description" : "BTW bedraagt 674 Fiscus 2021-07-13", "active":1 }

Somehow it doesnt work. Can you help me with what fields needs to be changed to complete a milestone and edit the report

I see: "active" and "checked" should be true or false, but that doesnt change

We are looking into and will update you.

Hey @Hermes

We looked over your API and tried the same at our end too. But it is not working accordingly and neither it is updating. So, we would recommend you to contact Flowlu's support for better understanding.