How OSB handling null element?

hi Guys,
I having question about how to handling a null node during trasnfortation and mapping using oracle workshop for OSB 10g.
Well i have a consumer that not sending the element into the proxy, so during the proxy i will need to transform it into null element to the provider. what's in my mind is transform the element tag into something like this
{ if (fn:nilled($getAssetAttribReqParam1/RequestHdr/ns1:RequestId)) then
<ns1:RequestId xsi:null = "true"/>
else
(<ns1:RequestId>{ data($getAssetAttribReqParam1/RequestHdr/ns1:RequestId) }</ns1:RequestId>)
but when i doing testing it still showing this
<ns1:RequestId></ns1:RequestId>
i will need to sent the element something like this to the provider. because if this element is date format it will fail in the validation if i sending *<ns1:RequestId></ns1:RequestId>*
<ns1:RequestId xsi:null = "true"/>

I think your case should be addressed like -
if ($getAssetAttribReqParam1/RequestHdr/ns1:RequestId) then
<ns1:RequestId>{ fn:data($getAssetAttribReqParam1/RequestHdr/ns1:RequestId) }</ns1:RequestId>
else
<ns1:RequestId/>
Regards,
Anuj

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