OCM_period__c
    & 
CASE(month(DATEVALUE(CreatedDate)) 
,4,"A",5,"A",6,"A",7,"A",8,"A",9,"A", 
10,"B",11,"B",12,"B",1,"B",2,"B",3,"B","")
    false
    Case((year(DATEVALUE(CreatedDate))+ 
Case(month(DATEVALUE(CreatedDate)), 
1,-1, 
2,-1, 
3,-1,0)), 
2020,"153P", 
2019,"152P", 
2018,"151P", 
2017,"150P", 
2016,"149P", 
2015,"148P", 
2014,"147P", 
2013,"146P", 
2012,"145P", 
2011,"144P", 
2010,"143P", 
2009,"142P", 
2008,"141P", 
2007,"140P", 
2006,"139P", 
2005,"138P", 
2004,"137P", 
"ERROR")
    BlankAsZero
    
    false
    false
    false
    Text
    false