Custom Scale Field Object

ACAD 2012

I want to have a viewport scale displayed on my titleblock, that will update if the viewport scale changes.  I use a field, object, custom scale and it returns the scale with_XREF appended to it.  I have an xref in the drawing and I display it through the viewport.  Is there a workaround to get ONLY the scale of the viewport, not the XREF scale?

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