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Count all the hours together (every invoice) for that costumer for the year 2010

Question asked by michael_alexander@me.com on Aug 25, 2010
Latest reply on Aug 26, 2010 by michael_alexander@me.com

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Count all the hours together (every invoice) for that costumer for the year 2010

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I have a question:

I have a contractbase and a invoicebase. Everytime we send a invoice it's on hours. Now we want to count all the hours together (every invoice) for that costumer for the year 2010. 

How do i do that?

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