Struct ExpenseAccountingService 

pub struct ExpenseAccountingService { /* private fields */ }

Service for automatically generating journal entries from expenses

This service implements Belgian accounting logic based on PCMN (AR 12/07/2012):

• Expense creates debit to expense account (class 6)
• VAT creates debit to VAT recoverable account (4110)
• Total amount creates credit to supplier account (4400)

Inspired by Noalyss’ automatic journal entry generation

Implementations

impl ExpenseAccountingService

pub fn new(journal_entry_repo: Arc<dyn JournalEntryRepository>) -> Self

pub async fn generate_journal_entry_for_expense( &self, expense: &Expense, created_by: Option<Uuid>, ) -> Result<JournalEntry, String>

Generate journal entry for an expense

Belgian Accounting Logic (PCMN)

Example: 1,000€ HT + 210€ VAT (21%) = 1,210€ TTC

Debit:  6100 (Expense account)     1,000.00€
Debit:  4110 (VAT Recoverable)       210.00€
Credit: 4400 (Suppliers)           1,210.00€

Arguments

• expense: The expense to generate journal entry for
• created_by: User who created the expense

Returns

• Ok(JournalEntry) if generation successful
• Err(String) if validation fails or expense has no account_code

pub async fn generate_payment_entry( &self, expense: &Expense, payment_account: Option<String>, created_by: Option<Uuid>, ) -> Result<JournalEntry, String>

Generate journal entry for expense payment

When an expense is paid, we record the payment:

Debit:  4400 (Suppliers)           1,210.00€
Credit: 5500 (Bank)                1,210.00€

Arguments

• expense: The expense being paid
• payment_account: Account used for payment (default: 5500 Bank)
• created_by: User who recorded the payment

pub async fn expense_has_journal_entries( &self, expense_id: Uuid, ) -> Result<bool, String>

Check if expense already has journal entries

Prevents duplicate journal entries for the same expense.

pub async fn get_expense_journal_entries( &self, expense_id: Uuid, ) -> Result<Vec<JournalEntry>, String>

Get journal entries for an expense

Returns all entries (expense entry + payment entry if paid).