PE51 design issue

Hi,

I have a question when I design payslip by PE51.when I use PC00_M28_cedt to print the form,if I retroact there are two same wage type .How can I distinct these wage type?

for example:

Layout of retroactive runs = "S"

basic pay 5000

basic pay 2000 --- this wage type maybe carry-out from last month.

please help me.

Thanks.

ZQ