Since I posted my initial request, I had found that the field 'RI_ID' in the smServCall table, there were values that I saw of 0, 3, and 10. Once I changed this value to 0 I was able to select the invoices for printing with no problem.
I will say that I'm having the same problem again, but the value in this RI_ID field is 11.
Can you please tell me what this field is and what the different values mean?