checklist follow-up

Hello
In Projeqtor 6.2.4, I'm using different checklists associated to different Activity types that my engineering team have to check as they go ahead on the project life-cycle. I'd like to compute a quality indicator using the "checkCount" field in the checklist table in order to assess how many activities are correctly followed-up via checklists.
Unfortunately, I realized that the checkCount field is always 0 even if my engineers put some checks on the checklist items.

Am I missing something or is this an issue with 6.2.4 ?
Thank you for your advice.