We have a checkbox field that uses a formula to decide when to check it or not. We have a case where formula "fails" all IF statetments until you reach the "Opportunity Year 1 Term equals 12, Opportunity Year 2 Term equals 12, and Quote Line Year equals Year 1". When it reacheds that statement it should check the box but this is not happening. Does anyone have any suggestions:
 

IF (
    Bookings_Override_True__c  = TRUE, TRUE,
      IF(
        Bookings_Override_False__c = TRUE, FALSE,
          IF(
            AND( Opportunity_Record_Type__c = 'Amendment', Line_Level_Detail__c = 'Customer Credit'), FALSE,
              IF(
                AND(Opportunity_Record_Type__c = 'Amendment', Line_Level_Detail__c <> 'Customer Credit'), TRUE,
                  IF(
                    AND(Opportunity_Record_Type__c <> 'Amendment',  Bookings_Override_False__c  = FALSE,  Bookings_Override_True__c  = FALSE, 
                      Line_Level_Detail__c = 'Services'), TRUE,
                        IF(
                          AND(Opportunity_Record_Type__c <> 'Amendment',  Bookings_Override_False__c  = FALSE,  Bookings_Override_True__c  = FALSE, 
                            Line_Level_Detail__c <> 'Services',  Line_Level_Type__c  = 'Removed Product'), TRUE, 
                              IF(
                                AND(  Opportunity.Year_1_Term__c   = 12, Opportunity.Year_2_Term__c  = 12,  QuoteLineYear__c  = 'Year 1'), TRUE,
                                  IF(
                                    AND(  Opportunity.Year_1_Term__c   <= 12, ISNULL( Opportunity.Year_2_Term__c ),  Year_Hidden__c  = 'Year 1'), true, 
                                      IF(
                                        AND(  Opportunity.Year_1_Term__c  < 12, Opportunity.Year_2_Term__c  = 12,  Year_Hidden__c  = 'Year 2'), true,
                                         false ) 
)
)
)
)
)
)
)
)