API user required privileges to manage PlanningElement

Hello
After nearly 2 years of Projeqtor use to manage 100+ projects, I'm using API to manage them in an industrial manner (including activities / milestones / meeting).
I can add / modify any kind of object but facing an issue with PlanningElement : when I want to update for example the 'validatedWork' of an activity, it is never taken into account.
API call is : (PUT) http://myserver/projeqtor/api/Activity with json data {'id':100, 'validatedWork'=20}
API returns : NO_CHANGE

The only way to make it work is to use an API user account with Administrator profile... which is NOT what I want in production environment for obvious security reasons.
I looked for every profile / access rights in projeqtor, playing with many combinations for my API user but no solution found.
I don't have enough time to dig into the persistence & security models of Projeqtor, could you give me feedback about that issue?

Regards

PS : using ProjeQtOr v6.2.4

Hello and thank you for your reply

I'm planning to upgrade from 6.x to 7.x but not so easy due to my organization and operational constraints...
However, I finally found the missing authorization for my API user: going to Specific Access > Visibility of workload and costs = All visible solved it.

You're right, I'm using API to change validatedWork on elementary (sub)tasks only, with automatic consolidation, so I have no issue with parent tasks

Cheers