Why does BPA transaction print program never use my external template to print?

Hi, I am using Oracle 12.2, and I am exploring BPA functionalities.

I have only one new rule that I created to print invoice.

for the Online Bill, I have a template that I created via BPA template manager (temp A).

for the Printed Bill, I have one RTF template that I followed XML publisher to create (temp B) (also successfully mapped data).

However, every time I run "BPA transaction print program", in the log, i see it always use "Default invoice template" instead of the Printed bill that i uploaded(temp B).

For testing purpose, I created another template via BPA template manage (temp C), and replace TempB with TempC in the same rules, and run the "BPA transaction print program" again, I see the log says it use "Temp C" as template.