Same issue. However, changing case has not helped. It is failing on the Datatables load generated by the RAD TOOL. Other columns load except for the VIP_Contact column. The edit form works. Server side service is loading correct data. Column order is good.
DataTables warning: table id=SourceSystemsTable - Requested unknown parameter 'sourceSystem.vIP_Contact' for row 0, column 7.
HTML file
<div class="col-md-3">
<div class="form-group">
<label for="VIP_ContactFilterId">@L("VIP_Contact")</label>
<input type="text" class="form-control" name="vIP_ContactFilter" id="VIP_ContactFilterId">
</div>
</div>
JS File
listaction:
...
vIP_ContactFilter: $('#VIP_ContactFilterId').val(),
...
{
targets: 7,
data: "sourceSystem.vIP_Contact"
},