Tax Number Type (STCDT) attribute in MDG S

Hi,

I do not find attribute 'Tax Number Type (STCDT)' in MDG BP data model. I need to add this field on MDG UI for Supplier Change Requests.

I found this attribute in 'Metadata about data models' in Supplier Metadata excel as shown in the screenshot below. This is mapped to MDG Entity Type - BP_TAXNUM and MDG Attribute - TAXNUM.

Comments column says "n/a (CVI Mapping to STCD1 - hidden in genIL)", what does it mean? Do I have any method to add this field to UI other that data model extension method ?