quantity doesnot match distribution quantity

when a focal point is trying to approve several purchasing requests made from the branches in order to reach the purchasing department an error appears as follows

Line # 2 quantity24 doesnot match distribution quantity 48
Line # 3 quantity24 doesnot match distribution quantity 72

we are using 11.5.9

this problem occurs when the user is trying to approve more than one item,if each item is approved separately no problem exists

Message was edited by:
M.S