Why TN can't send FA automatically?

Hi,
I have configged both “FAReconciliation EDITPA Variable” and “FAGeneration/autoGenerateFA EDITPA Variable” to “true”,but still there is no FA generated(I can’t find any 997 X12 envelope from TN webpage "Analysis > Transactions > Search Results ").Why?
But if I use “generateFA” service to generate a FA manully,I can find it in the TN webpage "Analysis > Transactions > Search Results ",and I can use “send” service to send it to my partners completely.
Dose TN can outbound FA to trading partner automatically if TN can generate FA automatically or manually?

Thanks