Hi,
You can find this in US BC18.5 for example when you use the Accountant or the Business Manager role center.
This function is supposed to be used for importing the G/L transactions from your payroll service provider.
When you use this function in CRONUS you get the following selection:

In other local versions, like DK, you can find a set up in the General Ledger Setup page

And yes, in the Data Exchange Defnitions there is option field Type with an option "Payroll Import".
This concept is used within the DK DB.