This topic was answered for 2018 taxes as per
https://ttlc.intuit.com/community/state-taxes/discussion/md-form-505-nonresident-return-does-not-fil...
However, this process of adding box 12, Code S does not work in 2019 taxes. I have tried and its not working. Is there another place to make sure that the PTE flows properly to MD State Form 505?
