Work-Cover-.UpdateOpenCoveredTasks activity is being triggered by a Work-Cover-.UpdateCoveredTasks trigger based on pyWorkStatus property. when status of cover is changed to "Resolved-xxxx" or "Pending-xxxx" and pxCoveredCount is greater than zero. It is a OOTB functionality. Error says that pxCoverInsKey is not a Database Column. This error is due to access restrictions that are imposed on operators. Like Operator A is not supposed to open the assignment of Operator B work list.