Hi Steeve,
My suggestion is please check the usage level in Inspection lot and inspection plan.
i.e in Figure 2: For the given inspection lot usage indicator Q mentioned.
In same way check in Inspection plan task list level Usage Q is assigned or not. If Not, please assign corresponding usage in both as same usage.
Save inspection plan.
Then change the Key date to Inspection plan saved date or key date and click the task list/spec in inspection lot.
Now it will assign.
Refresh the inspection lot and recheck the inspection lot status.
Please share the feedback.
Regards,
Iyyappan S