inheritance from multiple tables into shared table

I'm attempting to store attributes common to 2 entities into 1 table (Table C) as per below diagram.  The problem is that I can't maintain Referential Integrity.  The Table C common attributes are enrichment data (i.e., data gets added to the base records in Tables A and B during a subsequent vetting/enrichment process).  The cardinality between Table A and Table C is 1:1, and likewise between Table B and Table C.  Is there a way to structurally handle this situation and still maintain Referential Integrity?

Thanks,

John 

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