Yes it is.  I don't know if anyone is aware of it though.  @Charlene_At_Intuit

In my case income was low enough that filing H of H was same result.  Because you cannot list child in both places.

I thought I saw someone a few weeks ago (maybe that was in the ProSeries FB group) that just entered the childs first name in the other Part II Box 5 and the error went away.

I knew I saw some kind of workaround!  I haven't had a QW in many years.

not a workaround--dependents full name must show near T/P's ss# in right hand corner of 1040

#5 QW    Qualifying Widow(er) child's name is invalid for Electronic Filing.  The qualifying child's name field must contain a minimum of 1 alpha character (s).