The following applies if you are using a version of the software before Update 40. For the latest information, see Make a widget dependent on another widget.
Before Update 40, when completing the URL to return the required data, variables should be wrapped in single quotes ' for all properties except enumerated lists. Therefore the example to configure the widget CRList as described, requires the following in the URL field:
Tags('{{WIDGET_TAGLIST_ID}}')/SDATagsChangeRequest?$filter=Status eq 'IN PROGRESS' or Status eq 'OPEN' or Status eq 'APPROVED'&$select=Name,Description,Status