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How to add numbers of return tool with current number

Question asked by asgarian.masoud on Oct 8, 2017
Latest reply on Oct 9, 2017 by Orlando

Consider, I gave 10 pieces of special tool to a worker and the current number of that tool is 30.lately I calculated the current number by this formula tool::NUMBER-Sum ( Order::num ).

Now the worker gave back 5 pieces of that tool and have 5 pieces, so the current number is more than previous.I wanna calculate the current number, but any way I try is not correct. Would you please help me?