creating a metadata field that automatically populates sequentially

In URM, I am trying to create a metadata field that updates automatically, depending on the year and the last number used. 

So, the value should be VYY-9999     where YY is what ever year it is so in this case, 09, and where 9999 is the next sequential number used for that year, assuming that the first content that was saved was 0001 and each additional content added is one greater so the next one would automatically have V09-0002 and then automatically switch to V10-0001 when the year changes.

Any ideas would be appreciated.