Please use following link to download manuals for BI:
https://hansaworld-web.s3.amazonaws.com/university/university/HWU%20Materials/SERP_BI%20and%20KPI_8.5_MAC.pdf
Actually a new version of this bug is SL>>Reports>>Periodic customer statement "accumulates" amounts
Not sure why it was duplicated, I clicked "submit"only once....