We should set the occurance of the sequence including the assessment interval to "unbounded", as shown here:

	<xs:complexType name="CompensationType">
		<xs:sequence maxOccurs="unbounded">
			<xs:element name="AssessmentInterval">
...

Using this change, we can express diffferent penalties etc. in different intervals, which meets an important business 
requirement.

Illustration:

<wsag:BusinessValueList>
	<wsag:Penalty>
		<wsag:AssessmentInterval>
 		  <wsag:TimeInterval>PT1M</wsag:TimeInterval>
		</wsag:AssessmentInterval>		
 	        <wsag:ValueUnit>USD</wsag:ValueUnit>
		<wsag:ValueExpression>5</wsag:ValueExpression>
		<wsag:AssessmentInterval>
	   	  <wsag:TimeInterval>PT10M</wsag:TimeInterval>
		</wsag:AssessmentInterval>
		<wsag:ValueUnit>USD</wsag:ValueUnit>
		<wsag:ValueExpression>10
                </wsag:ValueExpression>
	</wsag:Penalty>
</wsag:BusinessValueList>