find duplicate and clear possible corresponding matching value

Ive added some dummy data .... so that you can follow it through...

Click on the 'Find and calculate actuals' button.. select January, then click on the first WBS entry within the Forecast WS for the input, then click on the 1st black cell in the bleh column (R4)...

it will do the matching and copying, then it will crash, though then you can see that the values copy and you can see where the code crashes (the blue code as per my first post)