Input parameter required but not used

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Hi all,  I have a Microflow that retrieves, from the datebase, a list of dates then has some xpath constraint.  I have a warning that says the variable is never used. But if I remove it I get an error saying it requires one parameter.  Does anyone know how can remove the warning... I resolved near 200 warnings and this is the only one left so i'm really wanting to get rid! :P Thanks in advance Garion
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Can you delete the parameter and then create the retrieve again in an empty canvas?

I experienced similiar refreshing issues for the modeler when he was looking to an elder setup in the canvas.

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