How to add nillable="true" automatically in Siebel generated WSDLs?

Hi All

We are developing couple of inbound Web Services & shared the WSDLs (generated by Siebel) to External Application. But External Application Development Team is expecting nillable="true"

property in WSDLs.

Hence, while creating the XSDs, we have added the nillable="true" property for all applicable elements. But after generating WSDLs (thru Siebel Web Client) we have observed that,

nillable="true" property has not been added for the aforesaid elements. For an example,

XSD:

xs:element name="RequestID" nillable="true">

<xs:simpleType>

<xs:restriction base="xs:string">

<xs:maxLength value="64"/>

</xs:restriction>

</xs:simpleType>

</xs:element>

WSDL (Actual):

<xsd:element name="RequestID" maxOccurs="1" minOccurs="0" type="xsd:string"/>