Good question.  Lacerte's diagnostics  indicated that if you are filing a CAT 5 Form 5471, you need to include Schedule P or you get a critical error.  Ironically, the foreign corporation is new and has never had any profit & earnings, and therefore there is no previously taxed E&P to report.

Once you include the Schedule P, Lacerte's diagnostics indicate that the Schedule P can't be E-filed and you are instructed to attach a PDF copy and link it to Form 5471 Schedule P on input sheet EF 4.1.  I did this, but the Schedule P diagnostic doesn't go away.  

The specific Critical Diagnostic Warning is "e-file: Form 5471 #1: Schedule P is not included in the efile and must be manually attached in the Electronic Filing screen as a PDF attachment. [ref. #2051972]

Any assistance in resolving this issue so that I can e-file would be greatly appreciated.  FYI, this is for a 2018 individual tax return.