Extended Data Types not visible in the mapper of Stage File action for Read Operation as source

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Hi Everyone,

I'm trying to make use of the Extended Data Types functionality in OIC. I can see this being available in the mapper where my source is a Trigger Connection (see first image). But I cannot see it in the mapper where the source is the response of a Stage File action for Read Operation (see second image). The WSDL and XSD for the Connection and Stage File action, respectively, have similar structure where elements are of complex type with abstract attribute equal to true. Anyone who is familiar why Extended Data Types option is not available in Stage File action