def findLatestUserStateForFullMonthBilling(userID: String, bmi: BillingMonthInfo) = {
_userStates.filter { userState ⇒
userState.getUserID == userID &&
- userState.getIsFullBillingMonth &&
+ userState.getIsForFullMonth &&
userState.getBillingYear == bmi.year &&
userState.getBillingMonth == bmi.month
}.lastOption