Hello Arijit,
As per my understanding, QP06 transaction is to check Missing/ Unusable Inspection Plans for Materials. You can only display inspection plans for those items for which the indicator that there is no inspection plan is not set. If entry is missing means Material is assigned with Inspection Plan.
Even after changing the Key date and choosing Task list / Spec. button in inspection specification Tab in QA02, it shows the same error "No Inspection Plan could be found".
For Criag Querry: As per process inspection type 10 and usage 06 in inspection plan, Quality inspection lot will be generated as soon as Delivery(OBD) is created irrespective of Picking and packing transactions are performed.
Thank you.