Passing null value to a Date field in OPA

Hi,
We are using Determinations server of OPA.
I have created OPA web service proxy classes and using java client class for calling methods of OPA web service.
Webcenter calls OPA web service for validating business logic. There is a Date field in OPA which is not mandatory, if web service is called with date value, logic is working fine, else if we pass null value or ignore setting Date value all conclusion of the rule is becoming false.
for example :
If agreement exists, pass agreement expiry date.
Setting Input attributes if date is not null:
global.setAGREEMENTEXPDATE(new DateAttributeType());
global.getAGREEMENTEXPDATE().setDateVal(xmlGrogerianCalendar);
if there is no agreement, pass null for agreement expiry date
we are not setting Date attribute and sending request to the server
Is it need to pass Attribute if it is not mandatory and has no value?
If yes, how to pass null value?
Please help on this.
Thanks,
Sri

All optional parameters needs to be send to the OPA Determination Server, if value is not known then that attribute should be set to the "Uncertain" value as shown below.
global.setAGREEMENTNUMBER(new TextAttributeType());
global.getAGREEMENTNUMBER().setUncertainVal(new UncertainValue());
Thanks,
Sri

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