Hi Laura,
Please request Data Feed through ClientCare. It will give the data as received and post processing. it will give a granularity of hits.
You can request all the data or just some columns. More details are here: http://microsite.omniture.com/t2/help/en_US/sc/clickstream/datafeeds_reference.html
Here is a list that I would use. (You can add more columns that are relevant to you) :
date_time
product_list
post_product_list
visid_high
visid_low
post_visid_high
post_visid_low
visit_num
visit_page_num
new_visit
event_list
post_event_list
pagename
post_pagename
page_url
post_page_url
referrer
post_referrer
purchaseid
post_purchaseid
duplicate_purchase
exclude_hit
ip
I will look at duplicate_purchase to see if you are sending same purchaseids and if you are sending the right values in product_list and the pruchase event is send in event_list.
Please bear in mind that SiteCatalyst will have some latency so I would compare data on day bases instead of real time
Best regards.
Alexis Cazes