Trade deficit and Holy Orders

[FactionHeir]

It needs some place to export to. Antioch is surrounded by castles, bologna and florence by cities.
Castles don't get trade fleets, cities do.

I think the way you want to be testing it is this:

Claim all regions around say Antioch. Now process_cq your way through to make all of them huge cities.
Destroy any ports you can find.
Now give each settlement there 1 port and nothing else. Note the trade income (check the breakdown screen for trade)

Save and exit.
Mod your EDB so that the wharf range does NOT increase trade base income but fleets only.
Up your game and build a wharf at antioch, going up the levels with this building only.
End turn after each build just in case.
Does the trade change as a result of those trade fleets?