From the all vendors list page or from the vendor master record, under the Invoice tab, user can open the vendor 'Default Account Setup' form.

this should allow the user to select one or more main accounts (or other account type) from the list in the left panel and even select one as the 'default' value. This form is similar to the feature in AX2012, but it works a lot less well:

• there is no splitter between the left and right panel and because the (not really useful) account type is shown by default there is not enough space in the panels to show the account name with enough characters to distinguish / select the correct account account. There is no option to hide the unwanted columns.
• the type ahead search that worked in this form in AX2012 doesn't work in D365FO : the list always starts with the first number, even if you type 615, the cursor doesn't move down in the list to the account starting with 615 like id did in AX2012.

Can this be fixed?

other remarks : there is no option to open the form in excel nor even to import it from excel as no data entity seems to be available.