Change `harga` into two different values: `hargaDalamKota` and `hargaLuarKota`.
Add `kode` to `Sales`.
Request to change the format of invoice's number (based on salesperson).
Save last price for a customer as BigDecimal rather than a discount.
Remember the last product's price for a customer.
Add product's quantity report grouped by warehouse.
Add sales report per sales person.
Add sales report per customer.
Add sales report per region.
Allow payment calculations to include/exclude giros.
Add account payable payments reports (laporan sisa piutang).