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Passing list of values from listpage form to RDP class

I'm attempting to modify a previously created SSRS report to allow selecting multiple sales orders and process the data for each sales order. I'm using the RDP/Controller/Contract pattern for this. It's successful when selecting a single sales order, but for some reason, getting the list of selected values is always showing as a null object in my RDP Class.

1. In my controller class below, I can see the salesIds list parameter contains the list of orders I selected. First parameter, salesId, is the original parameter that works today. I'm just setting it to the last selected salesId for now. It's not in the screenshot, but I use the MultiSelectionHelper class to iterate through the selected salesids and add them to the recordSet list variable.

2. In my RDP class, the salesIds parameter comes across as null. SalesId parameter retains it's value though.

Below is my code for my data contract. Am I doing something wrong in terms of the list parameter? I have refreshed the dataset in the report itself as well, so the parameter does show in the report.

[DataContractAttribute]
public class cdiSalesConfirmContract
{
    SalesId salesId;
    List salesIds;
 
    [ DataMemberAttribute('SalesId') ]
    public SalesID paramsalesid(SalesId _salesid = salesid)
    {
        salesId = _salesid;
        return salesid;
    }

    [
        DataMemberAttribute('SalesIds'),
        AifCollectionTypeAttribute("SalesIds",Types::String)
    ]
    public List parmSalesIds(List _salesIds = salesIds)
    {
        salesIds = _salesIds;
        return salesIds;
    }

}

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