Hi,
you can upgrade a report from 2009 to 2013 to maintain setdata\getdata functions as is if you like.
Search & read Claus Lundstrøm posts (the inventor of sql reporting services subset & rdlc technology for NAV 2009, 2013..);
Here a very nice link about report 206 redesigning technology and other tips
mibuso.com/.../simplifying-document-reports-in-nav-2013
Others posts here