Creating Ports & Setting Their Value to 0

[39cookies 1]

Hello ! I am trying to make my own map, but when I test it I cannot build any ports.
I was able to find on other parts of this forum that the land provinces must be set to 0 in the sea/land editor for them to work, but I can't increase the number past -1.

I found Lukasz saying that it was done automatically but I'm not sure what I should do to trigger the automated function. Should I just wait ?

Thank you !
 

[39cookies 1]

I found how to do it !
If you have connected a land province to a land province and then turned one of the land provinces into sea, it does not turn the other land province into a costal land province (0 or 1).

In other words, you need to make the province sea (-2) before connecting it to the land.