Thanks for your response! I havent seen the % sign as a valid operator in the available documentation for the possible calculations. What does % do and did you see this in one of the demo models or somewhere else? Does you proposal work in following scenarios:
KF2 is 5x KF1 e.g KF1 = 100, KF2 = 500
KF1 is 5x KF12 e.g KF1 = 500, KF2 = 100