Reparir order Quantity doubt

Hi Experts

When I'm creating a repair order  (RAS) from notification IW51, I'm having the following concerns.

1) If I take the Material Quantity say 5 & the serviceable quantity 5 too than its copied only 1 as quantity as 1 while the serviceable Item shows 5.

   While on the other side if I take order type the same quantity will is getting copied

    Why its showing 1 as material quantity?

2) How can create this repair order with reference to delivery from IW51?

Please elaborate

Regards