Auto Deposit Prenote

Hi,

I have a quick question regarding auto deposit prenote.  When we make a change to an individual employee auto deposit instruction, we use transaction code (Tr Cd) 23 to prenote this instruction, and then change the header prenote flag to an "N".  Recently, we changed two different instructions and used transaction code 23 on both.  The employee received two checks.  Is this correct functionailty?  Will a seperate check generate for every instruction marked to prenote (23)?  Thanks!