When "enter" is pressed, it automatically advances like the F4 key to the next item to verify, not the next field.
Start the Verification station, select any document, right-click on any field and check the following options:
It will define the ENTER key behavior. Here is the fragment from the documentation:
From the document window local menu, you can confirm a field, select to show format errors, copy values of cells to other cells, go to the previous or the next item to verify, select a data text size, as well as the mode of navigation through the fields. Select Go to Uncertain Field on Confirmation to navigate through uncertainly recognized fields. For navigation through fields with undetected regions, select the Go to Next Unmatched Field on Matching).