21 Feb 2014
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03 Jan 2017
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Unfortunately this is a known issue to The Portal Connector:
Linked-entity columns are neither sortable or filterable. An upcoming release will disable these columns from being clickable (sorting) or filterable so users won't experience an error.
This will not be fixed with the current grids, however it has already been fixed for the new TPC 4.0 MVC widgets.