E-conomic, what function to edit text in Bank reconciliation

Hello,

We need to add an reference number to the column pointed out here:

https://nimbus.everhelper.me/client/notes/share/512111/snzn3q95mobfi80da4w6

The idea is that right now it only states the payment method - but we want to have:

paymentMethod-OTHERID

So my question is simple, where in the API is this controlled? Which function/layout variable set's this text in e-conomic.