Hi Sanjay,
I tested in v84 2019-07-06 Build 902
1. In my sample database i have an invoice with 2 form templates defined, 1st for the invoice and 2nd for the activity.
2. When i print an invoice, then printer dialog appears two times (once for each form template)
Can you please tell me in which 8.4 version you were able to print single pdf with both form templates?