How to Automate Inventory Updates from Delivery Notes

Why delivery-note delays cost money

A delivery note says what a supplier says was delivered; it is not proof that your staff physically counted and accepted every item. If the paper stays in a receiving area or someone enters it days later, the stock record can lag behind the goods. That can lead to staff promising stock that is not available, delaying dispatches, making unnecessary purchases or overlooking a short delivery.

There is no dependable universal percentage for the loss caused by late or incorrect receiving. It varies with product value, turnover, perishability, order volume and how quickly errors are found. Instead of applying a generic benchmark, measure your own exposure: count receiving corrections, emergency purchases, delayed orders and the value of stock adjusted after a discrepancy. Compare those costs with the time spent entering notes and checking them.

For a practical baseline, record how many delivery notes arrive in a normal week, how long a person spends entering each one, and how many need correction. The weekly handling time is the number of notes multiplied by average minutes per note. That gives you a defensible reason to automate, without relying on a made-up savings estimate.

Manual handling versus an automated workflow

How to automate it step by step

Prepare the records first

Automation cannot reliably match items if your purchase orders use one name and your stock records use another. Start by standardising supplier names, item codes, units of measure and warehouse names. Decide how to handle common variations, such as a supplier’s product description differing from your SKU. Keep GST details where they are needed for your purchasing and accounting process, but do not treat a GST invoice or e-way bill as a substitute for the physical count. The receiving record should represent what arrived and was accepted.

Choose one intake route

Direct suppliers to a receiving email address or a controlled upload folder. If staff and suppliers already send document photos through WhatsApp, a WhatsApp Business API integration can receive media and pass it to the workflow. Access to the API and the configuration depend on the business’s Meta setup and chosen provider. Avoid using a staff member’s personal chat as the permanent record; it makes ownership, retrieval and duplicate control harder.

Keep the original PDF or image with a unique intake ID. Record who submitted it, when it arrived, the channel and its processing status. This creates a way to trace an inventory entry back to its source.

Extract fields and check the scan

Use OCR to read printed text from PDFs and photos. Google Cloud Vision can detect text in images; Google Document AI and Azure AI Document Intelligence offer document-focused extraction options. OCR output should be treated as a draft, not as verified stock data. Extract supplier name, delivery-note number, date, purchase-order number, item descriptions, quantities and units. If notes are handwritten, blurred, shadowed or photographed at an angle, extraction may be unreliable.

An LLM can help interpret variable layouts or suggest which description corresponds to a known item. It should not decide to increase stock based on a plausible guess. Use a known item-code table and explicit rules for posting. Send low-confidence fields or an item with no clear match to a review queue.

Match the note to an open purchase order

First match the supplier and purchase-order number. Then match each line to an item code and unit, and compare the delivered amount with the remaining open quantity. Allow for legitimate partial deliveries, but flag over-deliveries, unexpected items, unit mismatches and closed or missing purchase orders. Do not use a broad text match alone: two products can have similar names but different sizes, grades or packaging.

For a simple pilot, keep the purchase-order and item map in a protected spreadsheet, with a separate exception tab and a clear owner for reviews. For more reliable control, use your ERP or inventory system as the source of truth. Zoho Inventory’s purchase-receive API supports creating a receive against a purchase order and recording line-item quantities. TallyPrime supports a Receipt Note voucher linked to a purchase order; confirm the right integration method for your TallyPrime setup before sending records automatically.

Post only approved receipts

Once the data matches and the receiving check is complete, create a goods receipt in the system rather than overwriting an on-hand balance. TallyPrime’s Receipt Note records goods received and can reference the purchase order. Zoho Inventory’s purchase receive records items delivered and can affect stock on hand. A spreadsheet-only process should append a dated receipt transaction, not replace the existing stock figure with a manually calculated total.

Keep the source note, extracted values, PO match, approver and posting result together. When the supplier invoice arrives, reconcile it separately. A delivery note confirms a claimed delivery; it does not by itself settle the invoice, GST treatment or accounting entry.

What breaks, and how to prevent it

• Poor scans: Ask the receiving person to retake the image in good light, with the full page flat and in focus. If the supplier sends a better PDF, attach it to the same case. Hold unclear quantities for a human count.
• Duplicate documents: Check a combination of supplier, delivery-note number, date, PO and file fingerprint. A copied image may have a different file fingerprint, so also check the business identifiers. Never post the same note twice just because it arrived through two channels.
• Partial deliveries: Track received-to-date against the order’s remaining quantity. A new delivery should add only the newly counted quantity, not repeat the quantity from an earlier receipt.
• Similar item descriptions: Match by internal SKU or barcode where possible, then use descriptions as a supporting check. Require review when there is no reliable identifier.
• Wrong units or packaging: Define conversions only where the business has confirmed them. A carton and an individual unit are not interchangeable without a known pack size.
• Wrong warehouse or batch: Require a destination warehouse and, for tracked goods, capture batch, serial or expiry details. Do not infer these from an unrelated field.
• Integration failure: Use a queue with visible statuses such as received, extracted, needs review, approved and posted. Log failed API calls and retry safely only after checking whether the first attempt succeeded.

When not to automate

Do not automatically post a receipt if staff do not physically count or inspect deliveries, purchase orders are routinely missing, item codes are inconsistent, or stock is controlled in several unconnected spreadsheets. Fix the receiving policy and master data first. Keep a person in the loop for high-value goods, regulated or traceable products, damaged deliveries, handwritten notes and any mismatch that could affect customer commitments.

Automation may also be unnecessary when deliveries are rare and each note takes little time to process. A simple shared inbox and a consistent receipt checklist may be more appropriate until volume or error rates justify an integration. Start with one supplier group or one warehouse, review exceptions, and expand only when the workflow is dependable.

How long does it typically take?

Time depends on document variety, record quality, approval steps and access to the inventory system. A focused pilot with a single intake channel, a clean item list and one receiving location is usually a matter of weeks rather than a same-day setup. Work involving several suppliers’ formats, poor scans, multiple warehouses or custom TallyPrime integration needs more discovery and testing. Before rollout, test real delivery notes, including partial deliveries, duplicates, unclear scans and overages. Do not set a go-live date until staff can see and resolve exceptions and the team has reconciled test receipts against physical counts.