Slitherine

To cut it short, conquered enemy place in africa to get cheap access of rare resource for Rome that was required for some high level structures. The resource is one province from the coast and somehow the ancient people can't haul the goods to the closest port and send it to Rome.

The actual trade range of Latium includes the area in question but it still can't import it to Rome.

Suggesting that import/export should be able to track over land and after that send the goods overseas if the resource is within the trade range of the importing/exporting city.

"Resources are available if they are naturally occurring, manufactured or traded into the region or one of its neighbours."

So if the neighboring port province has a structure that requires the resource, it gets "traded into the region" and is then available for export.

Took me some time to figure out the trade mechanic, but I do understand it.

The goods in question is Frankincense. The only sources of the goods that is in the region close by is in of Syrtica and Cyrenaica in africa, and since they are produced locally one province inland from the coast, the only way to trade them to Rome is to go 50+ provinces by land via Egypt, Syria, Turkey, the balkans and then northen Italy to reach Rome. If it is a design feature that every single Basilea beyond five provinces of northen africa is to pay 21 gold to upkeep a building, because the labourers were not able to transport the goods 20km to the coast and to ship it 1302km overseas instead of trying to track 3241km via land to Rome, while managing to export the medical herbs from the coastal region next to the incense then fine, but I still think that some thought should be put into from where and to where the trade should flow.

What you stated is not true, the only way for an resource to be exported is for the exporting province to produce it itself. The only benefit of importing the resource to the coastal province via a building requiring the goods is that the neighbor provinces will have their "bonus" effects satisfied. There is no way to import a goods to a province, and then export it from that province to the target.

Just quoting the manual.