This is the fsmRmtInvErrCode property on a stats collection policy object, the numeric error code returned by a remote invocation the FSM workflow made while applying this policy, if that call failed. An admin sees a non-zero value here when the collection policy update failed to fully propagate, and uses the code to look up the specific remote failure that occurred. For example, an error code corresponding to a communication timeout in this field would tell the admin the policy apply failed because a remote endpoint did not respond in time.