Power Pivot running total measure by criteria

Hello,

I have a pivot table where I've manged to get a running total for a give 'item' and stopped the returned value being duplicated,

I thought the best way to do this would be keepfilters but could not get it to work, so wrote one measure

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Whch gave a running totaal by each item, then put this measure in ;

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the finished measure called NewT in attached workbook.

This does give the result I was after but not sure if it's a very good way of doing it, if anyone have any better ideas please let me know
work book attached showing all attempts.

Richard.