With the understanding that array means an associative array in this case, then the variable param.emissionRequest.agente is a struct of a struct of a struct. That is, an array of an array of an array.
That is 3-deep. Perhaps one layer too deep. You originally wanted an array of an array. So, what happens when you call the service with
<cfset emissionRequest = {}>
<cfset emissionRequest.codSuc = "30">
<cfset emissionRequest.producto = "200">
<cfset emissionRequest.poliza = {}>
<cfset emissionRequest.poliza.codTipoPoliza = "2">
<cfset emissionRequest.poliza.ramoComercial = "5">
<cfset emissionRequest.agente = {}>
<cfset emissionRequest.agente.ramoTecnico = "10">
<cfset emissionRequest.agente.codTipoAgente = "15">
