Thank you @George4Tacks for the very helpful reply.  I did not check the CARES Act box; that might be the reason.  I notice that in the individual program, there is a critical diagnostic if this box is left unchecked.  This diagnostic was not generated in the C Corporation program.

@IntuitBettyJo I wonder if it would be possible to correct the program so the transmittal letter does not mislead as to the payment date (i.e., July 15 does not appear on the letter unless the CARES Act box is checked). 

Another possible solution on the user side might be to just override the payment date. 

I don't envy the Lacerte programmers this year.  This has to be by far the most challenging year they've ever faced.