The Transaction ID # is a unique identifier assigned by FlipperForce to every transaction record you create.
Its purpose is to group and organize related expense line items in the Expense Tracker. For example, if you purchased materials and paid a delivery fee on the same receipt, those two line items share the same Transaction ID, so you can instantly see they belong to the same purchase or bank charge.
This makes reconciliation and auditing much simpler.
Read the full article: What is the purpose of the "Transaction ID #" column?