Creating custom broken wire error messages in xnode

[Stardom]

OK, so im being picky here. I have an xnode and i want a broken wire to appear with a specific error message ('not a 1d array'). Instead, the only way i can accomplish this is to set the 'broken wire' property in the GetTerms3.vi ability for the Term type to true. However, this has a preset error message, something about this being a polymorphic vi which can't accept this input.

Anyone know how i can create my custom error messages? I prefer broken arrows instead of run time error messages for type checking.