The Croatian ministry issued a statement on Thursday stressing that the two countries had determined together that Plovanija was an international border crossing, which undoubtedly proved that it was part of Croatian territory.
"In 1994 the two countries signed a protocol describing the border crossing of Plovanija as an international border crossing, which unequivocally proves that the crossing is on the territory of the Republic of Croatia," the ministry said in the statement.
"The Slovene side explicitly confirmed it in a note of 2002," it added.
Slovene Foreign Minister Dimitrij Rupel said earlier on Thursday that the Croatian border crossing of Plovanija was actually a temporary border crossing because the border had not yet been defined there. He insisted that the house of Josko Joras, situated near the border there, was on the territory of Slovenia.
Rupel's statement was published on his ministry's website.