create a product that has serial number as an attribute set instance.
create a PO for the product for qty 100.
create a Material Receipt header.
Create lines from the PO.
A single line (line 10) will be created with a qty of 100. Change the qty to 1 and enter the serial number and save the record. (qty per line must be 1 as each product instance has own serial number)
Use shift-F2 to copy this record ready to enter the next serial numbered product instance.
(a) ...The new line is created with a qty of 100 even though the line it is being copied from has a qty of 1.
(b) ... The line created from the 'copy record' has a line number of 10. I guess logically it should as it is a copy however for practical purposes the 'copy line' routine would be much more useful if it incremented the line number when it did the copy.
(a) seems to be a bug.
(b) is of lesser importance but a fix would be helpful.