I need to show a calculated measure named 'To Be Treated' which is a running sum of monthly count of patients as below -
|Count of Patients||2||1||3||4||2||0||3||2||0||4||2||5||0||2||3||1|
|To be Treated||13||13||17||19||24||24||26|
The treatment of patients is seasonal and happens only between Sep to Mar. 'To Be Treated' for Sep-17 will be sum of patients for 6 months from Feb-17 to Jul-17, for Oct-17 will be sum of patients from Mar-17 to Aug-17 and so on.