It would require changing the field type.. note that there are already
special keybindings for the number field to allow you to easily
choose the next number. For example, typing + will give you the next
number in the sequence. Adding the auto-complete might be relatively
challenging, but honest
I am more of a gnucash user than a developer, so please accept my apologies if this is not the right forum. It's a feature suggestion, and I didn't want to report it as a bug. This seemed the best place to bring it up.
In the check register several of the fields will autocomplete when you be
