How to Buy to Order From a Sales Order

Why special orders get forgotten between sales and purchasing

Some products are not kept in stock. You order them from the supplier only when a customer buys them. In practice the salesperson emails the buyer, the buyer types a purchase order, and nothing connects the two documents.

That gap causes the usual problems. The order is placed late, or twice, or for the wrong quantity. When the goods arrive, nobody can tell which customer they were for, and the customer asks for an update that no one can give.

With a buy-to-order route on the product, confirming the sales order drafts the purchase order itself. The sales order shows what was bought for it, the purchase order shows which sales order it is for, and lines already on a purchase order are never ordered twice.

Why this happens

• The buyer hears about the sale by email, days later.
• Purchase orders have no link back to the customer's order.
• The same line is ordered again after a follow-up message.
• A sales order cannot be confirmed because the item has no stock.

Biznsbook addresses this through buy to order route, drop-ship route, draft purchase order on confirm, link between sales and purchase orders in the Purchase module, on the same orders, receipts, bills and stock records.

Purchasing problems rarely start with one big mistake. They start with a price nobody checked, a bill keyed twice, or goods used before anyone looked at them. Recording each step where it happens removes those gaps.

Step-by-step: Buy to Order From a Sales Order

Written for buyers, store keepers and accounts payable teams in small and mid-sized businesses. The steps follow Purchase in Biznsbook.

1. Set the procurement route. Open Inventory → Products → Edit and, in the Stock section, set Procurement route to Buy to order. Choose Drop-ship instead when the supplier should deliver straight to the customer.
2. Mark a preferred supplier. In Replenishment → Supplier lead times, mark the preferred supplier for the product. A line with no preferred supplier cannot be ordered.
3. Confirm the sales order. Confirm the sales order as usual. Confirming does not need stock for these items: whatever is on hand is reserved and the rest is ordered.
4. Check the drafts it created. A draft purchase order is created per preferred supplier and warehouse for the quantity not yet ordered. Drop-ship items get a drop-ship order instead. The sales order shows Bought for this order with links, and the purchase order shows which sales order it is for.
5. Fix any line that was not ordered. If a line could not be ordered, for example because there was no preferred supplier, fix the cause and choose Order buy-to-order items on the sales order. Lines already on a purchase order are never ordered twice.
6. Finish the purchase and the sale. Submit and approve the drafts in Purchasing, receive the goods, then deliver and invoice the sales order.

Review results after the first full monthly cycle. Adjust roles, mappings, or approvals where the same exception repeats.

Inside Biznsbook, each Purchasing screen explains its own steps. This article explains the business process behind those screens.

Common mistakes to avoid

• Mistake 1: The buyer hears about the sale by email, days later. Repeating this each month usually shows up first in a supplier paid the wrong amount, late, or for goods that never arrived.
• Mistake 2: Purchase orders have no link back to the customer's order. Repeating this each month usually shows up first in a supplier paid the wrong amount, late, or for goods that never arrived.
• Mistake 3: The same line is ordered again after a follow-up message. Repeating this each month usually shows up first in a supplier paid the wrong amount, late, or for goods that never arrived.
• Mistake 4: A sales order cannot be confirmed because the item has no stock. Repeating this each month usually shows up first in a supplier paid the wrong amount, late, or for goods that never arrived.

Each of these shows up later as a supplier balance nobody can explain. Fix it on the order, receipt or bill rather than in a side spreadsheet.

Best practices that hold up as you scale

• Set the procurement route — Open Inventory → Products → Edit and, in the Stock section, set Procurement route to Buy to order.
• Mark a preferred supplier — In Replenishment → Supplier lead times, mark the preferred supplier for the product.
• Confirm the sales order — Confirm the sales order as usual.
• Check the drafts it created — A draft purchase order is created per preferred supplier and warehouse for the quantity not yet ordered.
• Fix any line that was not ordered — If a line could not be ordered, for example because there was no preferred supplier, fix the cause and choose Order buy-to-order items on the sales order.

Keep the order, the receipt and the bill linked, so every payment can be traced back to what was ordered and what arrived.

How Biznsbook supports this workflow

buy to order route is part of Biznsbook Purchase. It works on the same purchase orders, goods receipts and supplier bills, so stock, payables and the ledger stay in step.

drop-ship route is part of Biznsbook Purchase. It works on the same purchase orders, goods receipts and supplier bills, so stock, payables and the ledger stay in step.

draft purchase order on confirm is part of Biznsbook Purchase. It works on the same purchase orders, goods receipts and supplier bills, so stock, payables and the ledger stay in step.

link between sales and purchase orders is part of Biznsbook Purchase. It works on the same purchase orders, goods receipts and supplier bills, so stock, payables and the ledger stay in step.

Access is permission-based: viewing, creating, editing and approving purchases are separate permissions. Purchase orders and goods receipts need the Inventory module; postings to accounts payable need Accounting.

Suggested implementation timeline

1. Week 1: Set up buy to order route and give buyers and accounts payable the permissions they need.
2. Week 2: Run one supplier end to end in Biznsbook only: order, receipt, bill and payment, with no side spreadsheet.
3. Week 3: Review the exceptions with the people involved and adjust the rules where they disagreed.
4. Month 2: Roll out to every supplier and retire the old tracking sheet.
5. Ongoing: Monthly review using before you switch a product to buy to order.

Related guides

Cluster hub: Purchasing guides. Also see three-way match and, for approvals before an order, procurement guides.

The Purchase overview lists what the module includes; the Purchasing edition bundles it with receiving and accounting.

Industry: wholesale, manufacturing, retail.

Metrics to track monthly

• Open purchase order lines past their delivery date
• Bills waiting in bill matching
• Overdue supplier bills and bills due in the next 7 days
• Purchase price variance by supplier this month

Start with three metrics; trend direction matters more than a single point-in-time snapshot.

Spreadsheets and email vs Biznsbook Purchase

Compare a typical spreadsheet-and-email buying process with Biznsbook buy to order route and the related Purchase capabilities.

Before you switch a product to buy to order

Make sure the product has a preferred supplier in Replenishment → Supplier lead times, and, if the supplier has a minimum order or sells in packs, a row in Purchasing → Supplier price lists. Without a preferred supplier the line is left unordered until you fix it and choose Order buy-to-order items on the sales order.

Write the rule into your purchasing procedure so buyers, store keepers and accounts payable follow the same steps, and revisit it each quarter.

Frequently asked questions

How this differs by industry