Match vendor bills to purchase orders and receipts

Vendor bills compare ordered, received, and invoiced quantities before approval; returns reduce stock once and track expected versus received vendor credit.

Where: Inventory -> Money operations -> Vendor bills / Returns

1. Create or open the vendor, purchase order, and stock receipt for the pool chemicals or parts.
2. Enter the vendor bill and review the three-way match against ordered and received quantities.
3. Approve only after the receipt truth exists and the cumulative billed quantity fits the purchase order.
4. For a return, review the stock reduction, ship once, and record vendor credit only when it actually arrives.