how to get different attachment value in each line

I’m on my way in integrating Oracle EBS 11i with UCM 11g using Managed Attachment solution. The integration is based on Managed Attachment Solution document

In an OAF page, which contained an managed attachment button to the line, for each different line number should have different attachment (ie between different line number have other attachment), but in here, when the line 1 have new attachment, then the line 2 have attachment that same with line1.

 So, how to get the different attachment in each line ?

Thanks,

Akhmad