It can happen that a shipment isn't transported on the planned date.
The shipment below should have been transported on 23-3:

But due to circumstances it has been transproted on 31-3:

Which date will now be shown on the invoice?
This can be set on 2 places:
F11 -> Financial relations -> tab sheet Invoice
This concerns Loadingdate from order on invoice and Unloadingdate from order on invoice

F11 -> Company -> tab sheet Invoice groups

Here Loadingdate from order on invoice and Unloadingdate from order on invoice are also visible.