Formatting BigDecimal element in response

I have an element defined as:

<xsd:simpleType name="ShipmentType">
<xsd:restriction base="decimal">
<xsd:enumeration value="50" />
<xsd:enumeration value="60" />
<xsd:enumeration value="77.5" />
</xsd:restriction>
</xsd:simpleType>

The class generated by the wsdl2java tool expects a BigDecimal parameter:

public void setShipment(java.math.BigDecimal ship)

The problem is that passing a value of 50 to the method produces a value 
of "50.0" (no quotes) in the response.  How can I get the value 
formatted as in the enumeration?  I want the values to appear as 50, 60 
or 77.5.

Any advice or tips are much appreciated!

Thanks,
T