https://community.blueprism.com/t5/Product-Forum/Boolean-Not-function-in-Expression-Editor/m-p/67096#M19701 Please implement a Boolean Not function to the Flag type for example Not(False) = True Not(True) = False Fri, 15 Sep 2017 22:46:00 GMT Anonymous 2017-09-15T22:46:00Z https://community.blueprism.com/t5/Product-Forum/Boolean-Not-function-in-Expression-Editor/m-p/67096#M19701 Please implement a Boolean Not function to the Flag type for example Not(False) = True Not(True) = False Fri, 15 Sep 2017 22:46:00 GMT https://community.blueprism.com/t5/Product-Forum/Boolean-Not-function-in-Expression-Editor/m-p/67096#M19701 Anonymous 2017-09-15T22:46:00Z https://community.blueprism.com/t5/Product-Forum/Boolean-Not-function-in-Expression-Editor/m-p/67097#M19702 Hi michaell, As a workaround, you can use this instead, where the first Flag is the Flag you're working on. (Len(True)-Len(False)) * -1= 0 will return Flag: False (Len(False)-Len(False)) * -1= 0 will return Flag: True Fri, 15 Sep 2017 22:49:00 GMT https://community.blueprism.com/t5/Product-Forum/Boolean-Not-function-in-Expression-Editor/m-p/67097#M19702 EdwardKung 2017-09-15T22:49:00Z