https://docs.oracle.com/cd/F25599_01/p6help/en/helpmain.htm?toc.htm?44070.htm
BEI - Activities with No Project Baseline Finish Date Section of the Schedule Check Report Dialog Box
Overview
Use this section to view the data on activities that matched the requirements for the Baseline Execution Index (BEI) check. This check measures the number of activities that have been completed as a ratio to those activities that should have been completed according to the baseline.
Only a subset of the activities in the open projects are checked to see if they are complete or should have been completed. WBS summary activities, activities with no actual finish date, milestones, and Level of Effort activities are removed from the subset to create the list of completed activities. WBS summary activities, milestones, Level of Effort activities, and activities with a baseline finish later than the data date are removed to create the list of activities that should have been completed. The number of completed activities is then divided by the number of activities that should have been completed to find the BEI ratio.
