ADDITIONAL_CHARGE: Additional income related to contracts
ADDITIONAL_MODULE: Income of customers booking more modules to their main contract
DEPOSIT: Income of deposits (eg bottles)
FLAT_FEE: Income of fees, customers have to pay additionally to their main contract
MEMBERSHIP_FEE: Income of main contracts
REST_PERIOD_CONTRIBUTION: Income of charges made of customers putting their contract into an inactive “idle period”
SALE_OF_GOODS_AND_SERVICES: Income of selling a product (see product_name) or service (eg Shower 1x) with no product explicitely set up
STARTER_PACKAGE: Income of the initial/setup fee of a contract

CREDIT: Amount granted to someone, most often because of an illness
DEBT_CLAIM_REDUCTION: Amount discounting previous charges
DEBT_CLAIM_REVERSAL: Amount cancelling previous charges
DERECOGNITION: Loss of previous charges. Eg a customer did not pay and the charge is no longer followed up on.
REFUND_OF_DEPOSIT: Loss of a deposit (eg bottles) being returned
VOUCHER_EXPIRATION: Income of a multi-purpose voucher being expired.

BANKING_FEE: Income/Cost of fees related to payments
DUNNING_PENALTY_FEE: Income of charges made to a customers not paying on time
OTHER_FEE: Income of charges like address-requests or compensations in case of damages

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