Summary
Pins of a CallBehaviorAction must match the called Behaviour's BehaviorParameters.
Details
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The number of InputPins and the number of BehaviorParameters of type "in" and "inout" of the Behaviour must be equal.
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The number of OutputPins and the number of return BehaviorParameters and BehaviorParameters of type "out" and "inout" of the Behaviour must be equal.
Example:

The CallBehaviorAction "ITService" is invalid because the BehaviorParameter "nbDevelopers" of the called Activity "ITServiceActivity" is not matched to one of its Pins.
Tips
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BehaviorParameters that are valued by a constant may be
represented by a ValuePin rather than a simple InputPin.
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BehaviorParameters of type "inout" must be represented by both an InputPin for the "in" aspect and an OutputPin for the "out" aspect.
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Return BehaviorParameters must be represented by an OutputPin.