How to multi ssrs report in Ax 2012?

ReportDC

[DataContractAttribute]
public class HST_TrimPurchaseOrderReportDC
{
List purchId;
SelectableDataArea dataArea;

NoYes isPortal;
}

[DataMemberAttribute(identifierStr(PurchId)),
SysOperationLabelAttribute(“HST_PurchId”),
SysOperationHelpTextAttribute(“HST_PurchId”),
SysOperationDisplayOrderAttribute(“1”),
AifCollectionTypeAttribute(‘PurchId’, Types::String)
]
public List parmPurchId(List _PurchId = purchId)
{
purchId = _PurchId;

return purchId;
}

ReportDP

List value matching list

in Ax 2012 doesn’t not work multi…

but Visual Studio 2012 Report Preview does work!!!

same parameters… but Ax 2012 Report just only one report…

What to I do?