how to calculate a variable with a mf?

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Hi there, I have a variable to sum a list of decimal values. I want to calculate this variable using a microflow.   The Change action is to match the “Controlling” Entity with my mainentity “Project”   But I got following errors:  
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The SumNetto need to be returned by your micrloflow in order to use it as calculation microflow. You can also only have one parameter (The object that has this attribute.).

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Ok thanks, but how to set the association between controlling and project in retrieve action in xpath? Something like this?


???

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