I'm playing Vespasian and am puzzled by the criteria by which the Parthians are led to possibly declare war. The associated notification indicates that to keep tensions low I need 50 elements throughout
Syria Coele
Syria
Phoenicia
Palmyrena
Oshorene
Adiabene
Mesopotamia
Unless I've lost my ability to count, I've more than met these requirements but regardless was given a warning that I was hadn't. Is the criteria more complicated than it's letting on or am I misunderstanding something?