Am 16.10.2018 um 09:17 schrieb Yusuf Abduwahab Hassan:

Thank you very much for the clarification. This has improved my understanding on using the package.

Please when writing my report, do i refer to this test as Bai and Perron (2003) test or Lucchetti and Schreiber(2018). I am asking this question becuase i want to acknowledge the use of the package in my write up.

The test is not ours, it is just an implementation. So use Bai and Perron (2003) as the main reference. It is nice that you want to acknowledge our package, and of course you could do that in addition.
However I'm not sure about the correct way to do that, because it is not a paper. Perhaps the web page listing the function packages could be used: http://ricardo.ecn.wfu.edu/gretl/cgi-bin/gretldata.cgi?opt=SHOW_FUNCS
Or the direct link to the package documentation: http://ricardo.ecn.wfu.edu/gretl/cgi-bin/current_fnfiles/unzipped/StrucBreak.pdf
OTOH that link may not be stable over time.

cheers,
sven