Viewing the Constraints Applied to Variables

Variable	Constraint Status	Variable Properties
	Required field.	The Required property is set to True.
	Optional field.	The Required property is set to False.
	Required field with content type constraint.	The Content type property specifies an IS schema or XML schema.
	Optional field with content type constraint.	The Required property is set to False, and the Content type property specifies an IS schema or XML schema.
	Required field with default value.	The Fixed property is set to False, and the defaultValue property specifies a default value. The variable has a default value, but you can override this default value with any other valid values while executing the service or mapping the variables.
	Required field with fixed value.	The Fixed property is set to True, and the defaultValue property specifies a null value. The variable has a null value assigned to it by default and you cannot override this value. You cannot map this variable to another variable or assign any input values to this variable during service execution.
	Required field with fixed default value.	The Fixed property is set to True, and the defaultValue property specifies a default value. The variable has a default value and you cannot override this value. You cannot map this variable to another variable or assign any input values to this variable during service execution.