Unable to install new version of app without deleting old one first

When I get a new version of an app from my developers (with ad-hoc provisioning), if I just drag it to iTunes and then try to sync with my phone, the app does not make it over. Itunes/iphone dont realize that the new version needs to be installed. I am forced to delete the app from the phone first, and THEN doing the sync. This works, but of course this method loses all the the app data each time.
Is it possible to upgrade an iphone app in-place while preserving the old data? If so, how?
Also, I find that I have to delete the app from itunes as well before dragging the new version in . Otherwise the old version gets installed again on the phone.
Thanks in advance
Jay

This may be something unique with the ad-hoc provisioning used by your developers since the same is not required when installing an app update via the iTunes app store.

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Unable to install new version of app without deleting old one first

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