Movement allowed in Reservation not tick after cancellation

Question

Hi there,
We have a material reservation automatically created in our service module. We posted a goods issue in these materials (2 materials) 261 based in reservation and it was successful.
##result
Material document line item 1
Material document line item 2
However, one of the items needs to be return to stock as it was not needed anymore, hence we do the cancellation of the earlier material document as per normal cancellation.
But I realized, after the cancellation, the result was the first material was successfully cancelled but the 2nd line was not. It created another manual 262 which was not referred to the reservation. So the earlier 261 for reservation line item 2 was not cancelled at all.
When I further checked, the movement allowed box for the reservation line item 2 was not there and completely gone, which was a bit weird because earlier during goods issue we were allowed to post into it.
Now I am trying to activate again the movement allowed box but I cannot edit the reservation itself via MB22 because the reservation was not created manually, it was created auto from service order.
Anyway I can proceed in cancelling the 2nd line based from reservation? Any program or way to activate the movement allowed box in the reservation?
Thank you in advance.
Regards,

Answer 1

Do you two material document or both line items was in same material document?
Why you want to cancel both line items as you want only one line item to be cancelled?
Which Transaction You used for cancellation?
If your are using MBST transaction it tick the line item tick mark automatically as per std.
Check if you might have Un-tick while posting by mistake.
Reservation created through any other trns like service  order, PM or PS cannot be changed through MB22.
Rather it can changed by source element.
519580 - FAQ: Reservations