service order deletion not possible

Hi

I am trying to delete inspection lot for service order but i am getting message "inspection lot can no longer be deleted"

inspection lot status is LTCA (cancelled) .

I dont have information on how it is cancelled (QA02 or goods movement cancellation) but there is no goods movement i see from order.

There is a PO from service order but that does not have 'purchase order history' tab, that means there was never any movement happened so no cancellation in question.

order status is TECO and i cant set deletion flag without 'business completion', on business completion i am getting error message as below:

Inspection lot 140004066787 for order 5007983544 does not have necessary status

Message no. CO440

let me know how can i set deletion flag for service order.