If the setup in your Adserver and ADvendio don't match 1:1 when it comes to Campaign Items here is a way to align the delivery data.
You are pushing one Campaign Item from ADvendio but manually create more in the Adserver which you don't show to your advertiser/agency but should all be added up to one line when it comes to reporting and delivery numbers.
How to do it:
Manually add all "Additional Ad Ids" comma separated. Then run the delivery job as usual. The batch job sums up the delivery numbers for all ids.