SHOW DIMENSION = CURRENT SELECTIONS, SET ANALYSIS SUM FOR ALL RECORDS

[#1]

This formala is not calculating all records in the database but rather only the records of the selected items.  Can someone perhaps help or guide me where I am wrong?

(SUM({'1<USERNAME={GetFieldSelections(USERNAME)}>'}timeworked)/60)/COUNT({'1<USERNAME={GetFieldSelections(USERNAME)}>'}DISTINCT(MONTH))

Basically I need only records (dimentions) to show up that has been selected but the calculation should be (sum({1}timeworked/60)/count({1}distinct(MONTH)