Converting XML message Type to HL7 Message

For incoming XML i have custom schema which looks like the below 

Class CUSTOM.TXML.MainSchema Extends (%Persistent, %XML.Adaptor)
{

Property FieldSeparator As %String;

Property EncodingCharacters As %String;

Property SendingApplication As %String;

Property SendingFacility As %String;

}

Let me know any mistakes that i have made in this class please?

Thanks,

Smythee

Transformation is working fine. I am getting output from my transformation but when i am using same transformation in Business process.

Let me know any changes do i need to make in transformation 

XData DTL [ XMLNamespace = "http://www.intersystems.com/dtl" ]
{
<transform sourceClass='CUSTOM.TXML.MainSchema' targetClass='EnsLib.HL7.Message' targetDocType='2.5:ADT_A01' create='new' language='objectscript' >
<assign value='source.FieldSeparator' property='target.{MSH:FieldSeparator}' action='set' />
<assign value='source.EncodingCharacters' property='target.{MSH:EncodingCharacters}' action='set' />
<assign value='source.SendingApplication' property='target.{MSH:SendingApplication}' action='set' />
<assign value='source.PatientID' property='target.{PID:SetIDPID}' action='set' />
<assign value='source.FamilyName' property='target.{PID:PatientName().FamilyName}' action='set' />
<assign value='source.GivenName' property='target.{PID:PatientName().GivenName}' action='set' />
</transform>
}