Lot number refresh problem &reservation table

Hi ,

I created a transfer order for quantity 100. It has Lot tracking.
So I gone to item tracking lines and assign Lot for the quantiy 50. Lot Number = ABC/01
Then I try post system trhow s some errors regarding lot has to assign for remaining quantity.
So again I gone to Item tacking lines and I assigned the Lot.here Lot number is = PNF/05
Now I try to post . Still system throws the same error.
Again I gone through the Item tracking here I found on e thing that is there is no second Line.
Again I gone to table Reservation.
Here I need to delete the First one Lot number = ABC .01.
Again I come back to transfer order and and assign Item tracking lines for total quantity simultaneously.
Here the problem is if u forget to assign the Lot number for total quantiy.
U need to go to Table delete that entry

Why it is not taking that second entry .

Please share your experience.