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This tutorial covers Category 1 — Purchased goods & services and Category 2 — Capital goods. It uses a sample purchase of 1,000 kg of steel rebar at USD 2 per kg, for a total of USD 2,000. Have your supplier name, purchase date, quantity, price, and supporting invoice ready. You need editing access and an unlocked accounting year.
1

Open the correct year's Purchases table

Check the accounting year in the sidebar, then choose Purchases under Scope 3. Click Add purchase.
2

Choose the category and product

On the Product step, choose Category 1 or Category 2 and enter the Product name. For this example, enter Steel rebar. Click Continue.
Add purchase Product step with category choices and Steel rebar entered as the product name.

Choose the category and enter the product name.

If the product already exists, start typing its name and select it from the suggestions. Selecting an existing product sets and locks its category and unit, helping keep purchases and inventory connected.
Existing Steel rebar product suggestion shown after typing Ste in the product name field.

Existing products appear as you type the beginning of their name.

3

Enter the purchase details

Complete the Purchase step:If you selected an existing product, its unit is already set. Enter the quantity and price using that unit.Moya fetches the FX rate to USD using the currency and purchase date. For USD, the rate is 1. You can replace the rate when you need to use a specific rate. If fetching fails, enter the rate manually.Check the Total amount and Calculated total before continuing. In this example, 1,000 × USD 2 gives USD 2,000.
Purchase step showing supplier Orchid Steel, 1000 kg, price 2 USD per unit, and the purchase date.

Purchase details with USD selected and an exchange rate of 1.

4

Attach supporting documents

In Supporting documents, click Upload to add your invoice, or expand the section and tick an existing document from the pool. Attach at least one document.See Attach and reuse supporting documents for the full evidence flow. Click Continue.
5

Choose the emission factor

On the Emissions step, choose an EF type:
  • Activity-based uses the quantity bought. Choose CBAM or DESNZ as the database.
  • Spend-based uses the amount spent. Choose Open CEDA as the database.
For this example, use Activity-based, open Emission factor, and search for the appropriate steel factor. Use the available category and subcategory filters to narrow the results. Check the factor’s description and unit before selecting it.
Emission factor picker showing a search for steel and matching database records.

Search and filter the selected emission-factor database.

6

Check any unit conversion

If the purchase unit differs from the factor’s unit, Moya converts common compatible units automatically. For example, 1 kg = 0.001 tonnes.For a custom unit, enter both sides of the conversion. If one box contains 0.003 tonnes, enter 1 as the product quantity and 0.003 as the factor quantity. Use the quantities that describe your actual product.
Emission factor unit conversion showing the product quantity in kilograms and the equivalent quantity in tonnes.

A common mass conversion is filled in automatically.

7

Save and review the purchase

Click Add purchase. The dialog closes and the purchase appears in the table. Check its name, quantity, total, emission factor, and date.
Purchases table containing the saved Steel rebar purchase with its quantity, price, factor, and date.

The saved purchase in the year's Purchases table.

Click the small arrow on the left to expand the purchase details. The three-dot menu on the right lets you Edit, Duplicate, or Delete the purchase.

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If you cannot continue

A required field has a red border and an explanation underneath it. Complete each highlighted field. Quantity and price must be greater than zero for these categories, the currency and date must be selected, and at least one supporting document must be attached. If the Add purchase button is unavailable, check your workspace role and whether the accounting year is locked.
Last modified on October 5, 2026