Article class
@param articleFields: an array having key the Article field id (see class SettingsArticlefields) and the value
Ex: [articleFields] => Array (
[1] => HOT
[2] => Lamb
)
@param booking_account_id - id from class SettingsBillingBookingaccounts
@param accrual_account_id - id from class SettingsBillingBookingaccounts

@param arb_policy_id - ARB policy ID to be add to article
Note if there was already an arb_policy_id and it is not passed in the set function, then it is removed.