# EA have already been packed. Quantity cannot be changed. Message no. VL616
Automatic packing is implemented with packing instructions (POP3, POF1 etc.)
When delivery is created, the packing is complete (VBUK-PKSTK = C). User wants to decrease the delivery quantity of material (not packing material), then s/he gets the above standard error message. How to allow user to decrease delivery quantity of material, in outbound delivery?
' MoazzaM ' replied
As per my understanding I don't think so this would be possible. This is same like if we say we want to change delivery quantity after creation of invoice. We can't make change in preceding document until we reverse/delete subsequent document. Same logic applies here in packing. When we have packed material in handling unit system consider this as subsequent function and we can't change deliver quantity until we unpack it. Deleting handling unit is not required here but only unpacking is required.
I think you should automate this function using some function like you said in your above comment.