UPDM — 8.4.21.6 :Constraints

Typo input pin and output pin. Resolution:Fix text
Revised Text: [1] Asserts that if the source of the object flow is an outputpin, OutputPin then if the owner of the output pin is a CallBehaviorAction then its behavior is an OperationalActivity, or a CallOperationAction then its operation is an OperationalTask.
[2] Asserts that if the target of the object flow is an Input Pin, InputPin then the owner of the Input pin must be an OperationalAction - a CallBehaviorAction whose behavior is an OperationalActivity, or a CallOperationAction whose operation is an OperationalTask.

[3] The type of the input or output pin InputPin or OutputPin must be an InformationElement.