Abap report with header

Hi,

I am trying to create an ABAP report with a header and its corresponding list in the following format:

Vendor:---------                           

outline Agreement:

P.O.Number:123456

and below its corresponding list(line items)

service no | Service Desc|Total exe|Unit of mea|Total amount|

and then again the same.

Vendor:---------                           

outline Agreement:

P.O.Number:897659

and below its corresponding list(line items)

service no | Service Desc|Total exe|Unit of mea|Total amount|

So each time the p.o number is different.

Also i need the footer to change according which involves some calculations to change as per the p.o number and line items.

I tried to do this using control breaks but the list does not populate as per the p.o number

Can anyone suggest how to proceed with this?

Regards

Sarita