Open hub destination ---Additional property needed--

Hi,

I have one open hub destination object which is writing data from infocube to an external file (in appliaction server ) and the file is distributed to customers via Email---

This is absolutely working fine.

Now, i also need to extract the data from other datasource to the same cube ( which are nothing but corrections to original data existing in cube ) and the corrected data needs to be updated to the file in applucation server!!

as overwriting is not possible in infocubes i wonder how i could make the corrected data to be updated to the external files