How to call multiple objects in a wrapper class in Salesforce?

Hi,

I have two customObject like Payment_Schedule__c and Receipt__c.I want to display in VF page as table .So I used apex:repeat tag.I  have created the apex class like this which i mentioned below. Iam able to see the added list of item in debug. But if i called the list in VF page i will get the data.But it will repeat data.So how i can remove duplicate datas .Is it possible to write wrapper class for multiple objects?Can anyone help me to find a solution for this.

Thanks

Amritha