SAP BPC: Script logic. Use of When

SAP BPC: Script logic. Use of When.
An example of Script logic using When command.

*WHEN TIME

*IS <>TOT.INP

    *WHEN ACCOUNT

        *IS PERCENT.ALLOC

            *FOR %YEAR%=2003,2004,2005

                *FOR %MONTH%=JAN,FEB,MAR,APR,MAY,JUN,JUL,AUG,SEP,OCT,NOV,DEC

                    *REC(FACTOR=GET(ACCOUNT="TOT.OVRHEAD",TIME="TOT.INP")/100,TIME="%YEAR%.%MONTH%")

                *NEXT

        *NEXT

    *ENDWHEN

*ENDWHEN