So one of the problems I had when using 1 app rate module and one Liq. Module was this.
I was trying to fine tune my liq. Fert rate.
On the Liq. Module, I can go in and adjust the flow meter calibration number.
On the app rate module, that calibration number was configured in the setup.  Therefore the only way to tweak the flow meter calibration number was by building a new configuration.  Thus I could not change it.
The app rate module recorded fert. Put down by my ground drive pump.

This was with an Integra numerous years ago.  I have since  gone to an Incommand and 2 Liq. Modules and 2 electric pumps for my fertilizer on my planter.
I would not know it the flow meter calibration process has changed since then concerning the app rate module.