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Please help with application for 2015 entry

Hi! I am an italian student and I graduated from my italian high school this June, but I have spent the scholastic year 2012-2013 studying at another high school in Venezuela as an exchange student.
In the Education section of my application I added my italian high school, start date 2009, finish date 2014. Then I added the venezuelan high school, start date 2012 finish date 2013, but the website told me that I can't be a full-time student.
I asked UCAS staff and they told me that at least one of my schools has to be entered as part time attendance.
How is part-time seen by Admission Tutors?
What if I enter my italian high school twice (like before Venezuela, and after Venezuela) instead?