Debug Tab Options Disabled, Cannot test

I have process in workflow that I want to test but all the options in the debug tab are disabled and I cannot test my process.

The process simply obtains the required data from database, creates print content and outputs to a PDF file. The name of my datamapper and template begins with number e.g. 030002 OL.datamapper and 030002 OL.template. Could it be due to the names of the datamapper and template beginning with number or some other reason or I am missing something.

You have to load a sample data file to activate the debug tab.