I looked up the facts. The carrier is in fact a "seaplane tender", It was called Zmaj according to
THIS website.
Short facts about Zmaj/Zmaji:
Zmaj small seaplane tender
Displacement: 1,870 tons
Dimensions: 249 x 43 x 12 feet/75.9 x 13.1 x 3.6 meters
Propulsion: 2 diesels, 2 shafts, 3260 hp, 16 knots
Crew: unknown
Armor: probably none
Armament: 2 10.5 cm AA, 5 37 mm AA, 6 20 mm AA, 120 mines
Aircraft: 10 seaplanes
Concept/Program: A small seaplane tender which was in Yugoslavian service during the 1930's. Details of her history are sketchy.
Design: Large working deck aft, with a crane at its forward end, and another small working deck aft of the superstructure.
Departure from Service/Disposal: Captured by the Germans during WWII, employed for various duties, and sunk by British aircraft.
--------
WORKAROUNDS:
1. Delete it... Con: I like flavour.
2. Alter it to represent an AV (seaplane tender). Cons: Can it be done?
I tried to lower the strength of the carrier from 100 to 25 and started a game but it only costs appr 350 supply, 1,5 manpower and it only takes 3 months to "repair" it. So thats a no no.
I tried to change the "aircraft-load-capacity" from 1 (means it can take 1 plane??) to 0.5 but it could not be done in the editor (cant write "," or "." in it). If there is a way to change it from 1 to lets say... 0,25 then you could load a 25% strength torpedo plane on it

But then again... you cant build a plane that only has 25% strength... so it could in that case only have a starting plane and if its lost all is lost

.
3. Metamorphosis. Cons: None that I can think of.
Lets switch it from being a carrier to an custom made destroyer - more fragile and slower but with some special skill like high sea detection to represent the airplanes

My God my ideas regarding this matter is good!

---
BTW...
If this carrier should stay in the OOB... then several other countries should have AV's too. Sweden for example had three seaplane tenders... one of them being the seaplane CRUISER Gotland with 10 planes... Oh my... maybe I should flavour up all nations fleets according to real life naval OOB's... HOI would end up with a lot of small designed ships. Would be great methinks.