How To Pass Custom Class

I've created a custom class that extends to the standard  HS.Message.PatientSearchRequest. Inside the custom class i just want to pass the data as input only.

But i am getting ERROR #6277: Type attribute, s01:AcoPatientSearchRequest, does not specify valid type for XML input tag: pRequest (ending at line 5 character 171)
</error>

I tried adding Parameter XMLIGNOREINVALIDTAG = 1; and

Parameter XMLSEQUENCE = 0;

but does not seem to work. 

Class MC.ACO.Message.AcoPatientSearchRequest Extends HS.Message.PatientSearchRequest [ ClassType = persistent, Inheritance = right, ProcedureBlock ]
{

Parameter XMLIGNOREINVALIDTAG = 1;

Property RosterEffDate As %String;

Property RosterTermDate As %String; Storage Default
{
<Data name="AcoPatientSearchRequestDefaultData">
<Subscript>"AcoPatientSearchRequest"</Subscript>
<Value name="1">
<Value>RosterEffDate</Value>
</Value>
<Value name="2">
<Value>RosterTermDate</Value>
</Value>
</Data>
<DefaultData>AcoPatientSearchRequestDefaultData</DefaultData>
<Type>%Library.CacheStorage</Type>
} }
 

Any advice would be appreciated. 

Thanks!

Warren