Replace Values in Column with another Value

I have a problem similar to this...but the solution does not work for me.  I have a column (Projected Date) with nulls for some dates.  However, I do not want to replace all nulls in the column...only nulls for Plant "A", if Status is "D".  The nulls can be replaced with dates from another table.  I have attached the Power BI file...and below is a "mocked up" image of what I need.  

I have tried If, and LookupValue...I am just not getting the syntax correct

I would like to include examples, but I cannot see where to add the .pbix file...and if I paste the visual example, I get an error for too many rows.  Please email me so I can send you [email protected]