Thank you for your reply.

I believe  I have found the answer.  In Quickbook most generous method of never documenting any support to its end users, there is a limit on how many characters the cover email letter may contain.

I have always used this option to include our company's terms & condition with every invoice,estimate and sales order.  It worked fine in Quickbooks Premiere for the last 6 years, but coping the same text did not work in Enterprise (I even retyped the file in by hand).  Once I analyzed Quickbooks notorious method of limiting business work flow I realized that the "better" upgraded program Enterprise has more shortcomings than the Premiere edition.

As I started to shorten my text I was able to send the invoice.  I now cannot include my full copy of the terms & conditions, but that is now something else I will need to find a "work around".