C++ struct, why can't split struct !?

Hi,

i have a custom struct (first image), but the BP Split Struct Pin is grayed out (second image)!
How i can get this fixed ?

C++ struct code - the struct is implemented in a common header DataTypes.h
image

Split Struct Pin is grayed out

Even though struct values are visible in the settings panel
image

I got it working by initializing all values in the default constructor like this

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