TTY not Reflecting in FBL3N Report

Hi Gurus,

Transaction Type(TTY) is not automatically coming up in FBL3N Report, What can be the possible issue?

It has come in report when it was input manually in fb01, but technically it should've come automatically. Any setting that needs to be maintained? Documents generated via T Code MIRO.

Correct me if I'm wrong.

Thank You

Sachin