I don't do estate work but was executor of my mom's estate.  Not sure if I just got lucky or if there's a magic formula involved.  I filed Form 56 and attached a certified copy of the Letter of Qualification (what VA circuit court uses to appoint an executor).  Then when I efiled the 1310 there was a box to check saying "previously filed" for the LoQ.  (I think without that box checked PS would block efile).  Things may have changed since 2013.