you need to upgrade them in NV2009 only first and then import in NAV2013
Following link from MSDN will help you
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Yes.We need to follow below steps for converting Nav 2009 or Older version to Nav 2013 Report:
1)Exporting Nav 2009 or older version report object in .txt format
2)Import in Nav 2013 and Compile it . Go to Tools → Click on “Upgrade Reports”.
3)We need to Paste the code Pre-section code of Classic report in Data item - On after get record of Nav 2013 Report and for
we can use row visibility for Hidden
Please ignore if you this already.
for converting Classic Dynamics NAV reports to RDCL you can use Simplanova Report Converter - simplanova.com/…/