In construction, the Documento di Trasporto (DDT, the Italian delivery note) is a fundamental tool for the logistical and administrative handling of goods and materials. Filling it in correctly, and converting units of measure precisely, is what keeps company databases and order documents aligned. Here we look at why it matters, what the rules say about units of measure, and how alignment with ERP systems is handled.
Delivery notes in construction: role and features
The delivery note travels with the goods, acting as a "passport" for materials moved from one place to another. In construction it plays a particularly important part in tracing and documenting the materials used on site. For the general picture, including when it must be issued and how long it must be kept, see the complete guide to DDTs and their automation.
The main functions on site
On a construction site the delivery note does several jobs at once:
- Documents and tracks the movement of goods bought for the site
- Officially confirms delivery to the recipient
- Records warehouse movements
- Forms the documentary basis for issuing invoices
- Allows materials entering and leaving the site to be checked
For electrical and plumbing installers the DDT is mandatory whenever materials move from one place to another. The site manager needs detailed information about incoming materials, with origin, delivery method and quantity: that is how you verify that what was ordered matches what actually arrived.
Regulatory and practical aspects
On the regulatory side, the DDT also serves to overcome the "presumption of sale/purchase" under article 53 of Presidential Decree 633/1972. In short, it can be used when goods are delivered or received without ownership transferring at the same time, for example for storage, approval or processing, preventing inspectors from presuming that an invoice was omitted.
One quirk of the sector is worth noting: in law a works contract is a supply of services rather than a sale of goods. In construction practice, though, the DDT remains the document that proves materials were moved to the site and traces what was actually used in the works.
Units of measure on construction delivery notes
Stating units of measure correctly is a crucial point, with both operational and regulatory implications. It is also where construction differs from every other sector.
What the Italian Revenue Agency says
The Italian Revenue Agency, answering a request for legal guidance filed by Confindustria in an opinion dated 3 June 2015, clarified that the quantity of goods on a delivery note may be stated using different units of measure (kg, litres, cubic metres, square metres, linear metres and others), in line with the commercial practice of the sector. The clarification mattered because some companies had previously been challenged over how they filled in delivery notes during roadside inspections.
Practical implications in construction
That flexibility counts in a sector handling materials with very different physical characteristics: tiles are stated in square metres, electrical cable in linear metres, cement in cubic metres or kilograms. Being able to use the most appropriate unit for each material makes quantities immediately readable and easy to check against the order.
Conversion inside ERP systems
This is where the operational problem starts. When a delivery note is entered, the purchase unit of measure may differ from the one used internally in the warehouse. The conversion has to be done on every document, and done by hand it is a recurring source of error.
Software that integrates with the ERP, such as Typelens, automates that conversion. It removes the manual calculation and keeps documents and company databases consistent.
Proper alignment between databases and order documents makes sure technical specifications, quantities and units of measure stay uniform across the whole procurement process. That consistency is what prevents ordering errors, inventory problems and invoicing complications. The check that closes the loop is matching the invoice against the purchase order.
Frequently asked questions
What is a delivery note used for on a construction site?
It documents and tracks the movement of goods bought for the site, confirms delivery, records warehouse movements and forms the basis for issuing invoices.
Is a DDT mandatory in construction?
For electrical and plumbing installers it is mandatory whenever materials are transported. Even where the contract is a supply of services, in practice the DDT remains the document proving materials reached the site.
Which units of measure can be used on a DDT?
The Italian Revenue Agency, in an opinion dated 3 June 2015, clarified that quantities may be expressed in different units of measure (kg, litres, cubic metres, square metres, linear metres) according to the commercial practice of the sector.
Why are units of measure a problem on construction delivery notes?
Because materials have very different physical characteristics, and because the purchase unit often does not match the warehouse unit: the conversion has to be redone on every document.
What does overcoming the presumption of sale and purchase mean?
Under article 53 of Presidential Decree 633/1972 the DDT can be used when goods are delivered or received without ownership transferring at the same time (storage, approval, processing), preventing inspectors from presuming an omitted invoice.
What happens when the purchase unit differs from the warehouse unit?
A conversion is needed on every entry. Done by hand it produces recurring errors; software integrated with the ERP can automate it and keep documents and master data aligned.
Conclusions
The delivery note is a fundamental tool in construction, essential to material traceability and to administrative and logistical control. Being able to use different units of measure, as confirmed by the Italian Revenue Agency, gives practical flexibility in handling materials.
The delicate point remains conversion: understanding it, and having systems that handle it automatically, is what keeps company databases and order documents aligned, avoiding errors and simplifying administration. In a sector with such varied materials, handling units of measure well is a concrete advantage.