Data Structure

i need creat data structure pass wsdl function. 3 of 5 fields needs set null, can 1 please help. have far. problem tried set "", when running cfmx give me error of "string index out of range: 0 ". if set variables " "(with space in between) function works, not recognize null value on it's end

<cfset profile = structnew()>
<cfset profile.userid = "username" />
<cfset profile.password = "password" />
<cfset profile.batchid = " " />
<cfset profile.sessionid = " " />
<cfset profile.errorcode = " " />

do have control on wsdl method itself? if so, that'd better place @ converting empty string null value on insert (assuming it's doing sql insert).

or maybe this:
http://www.petefreitag.com/item/524.cfm ?

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