VBA: Array of User Defined Type passed as parameter to function

I've declared a User Defined Type as follows in Module 1:

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Then inside a sub some array variables are declared as follows (in the same module):

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These arrays are then populated with data. I now need to pass these arrays to another function that will combine some of the relevant data from each of the arrays and return me another array of the same UDT type e.g.:

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However; There is some problem somewhere?

I get the following error message:

Compile error:

Only user-defined types defined in public modules can be coerced to or from a variant or passed to late-bound functions.

Any ideas what's wrong or how to do this?

I do not think this declaration is valid

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When I change the type of variable C to string I do no longer receive any compilation errors