Case study: How Tehnoterm-Komerc runs its warehouse without retyping invoices
• 2 min read
The company
Tehnoterm-Komerc is a family-owned contractor from Belgrade, founded in 1984 and now run by a third generation of mechanical engineers. It designs and installs heating, ventilation and air conditioning systems, provides supervision and technical consulting, and builds fire protection systems: sprinklers, smoke extraction and pressurisation.
For the warehouse, that means many suppliers, many small items, and material constantly moving between the warehouse and several sites.
The problem: the invoice arrives, then everything gets typed again
Since e-invoicing became mandatory in Serbia, every supplier invoice arrives through the national SEF system. The data was already digital, yet the warehouse still retyped every line item and decided by hand which site it belonged to.
In a sample of 400 supplier invoices (December 2025 to July 2026) there were more than 70 suppliers, over 2,000 line items and around 1,300 distinct articles.
The solution: SEF straight into stock
We built the SEF integration in Buildx Warehouse together with Tehnoterm, on their real invoices:
- The invoice arrives on its own. Buildx pulls the incoming invoice from SEF with every line item, quantity and price.
- The warehouse manager assigns. Each item goes to a project or to the warehouse. No retyping.
- Stock updates itself. Warehouse and site stock are correct right away, and purchasing is tied to what is actually used on site.
Tehnoterm also tracks equipment in Buildx: who has what, where each tool is and when it is free.
Results
- Supplier invoices are no longer retyped.
- The team always sees how much of each material there is and where.
- Purchasing sees real consumption per project, which makes duplicate orders easier to avoid.
- Per-project consumption reports come from the same data, with no cleanup afterwards.
"Assigning materials straight from SEF invoices lets me make decisions quickly and get precise reports later."
Nenad Tomić, Procurement Manager, Tehnoterm-Komerc