Why purchase and payment need separate dates
A supplier may deliver 50 units today and accept payment in two weeks. Those units are available for sale now, so inventory should increase. Cash has not fully left, so the supplier balance should remain open. Combining both into one event makes one side inaccurate.
In Salelog, the purchase describes items, quantities, cost and location. A supplier payment describes the money paid. The two histories remain related through the balance without becoming the same thing.
An expense does not always create inventory
Rent, electricity, advertising, maintenance and some delivery costs support the business but do not place new units on a shelf. Recording them as merchandise can inflate quantity; omitting them can make an operational result look unrealistically strong.
Start with a few categories that help decisions. The goal is a consistent operating record, not to recreate a complex chart of accounts in a mobile inventory app.
A partial-payment example
For a $2,000 merchandise purchase with $800 paid immediately:
- the purchase adds the received products;
- the supplier balance increases by $2,000;
- the $800 payment reduces it;
- $1,200 remains open.
When the next installment is paid, add another payment. Editing the old purchase to the unpaid amount would erase what was originally received.
A weekly purchasing review
Compare received quantities with purchase records, review open supplier balances, look for duplicate expenses and inspect products whose cost changed. Reconcile material totals with the formal records maintained for banking, taxes and accounting.
