Construction Subcontracting — Mandatory Verification Before Payment (Odoo Online)

Construction Subcontracting — DYONYSOS compliance base

Free base, for Odoo 19 Community. It keeps subcontracting agreements, eligibility checks, certificates and payments — and it prevents a payment from being validated when the proof is missing or has expired.

The real problem. A company checks its subcontractor once, at signing, files the certificate in a binder, and pays for two years without re-checking. On inspection day, it is the main contractor who is liable for its subcontractor's debts, and the evidence it produces expired eighteen months ago.

What the module does. A check carries a date, a source, a result and a validity date. After that day it is worthless: the next payment is refused, with the reason written out — check missing, expired on such-and-such date, or unusable result. An override remains possible, but never silently: it requires a written reason, records the name of the person taking it and the date, and is logged in the payment's chatter.

What the base module does not do — by design. It knows no country. The withholding rate, the re-verification frequency and the list of required documents come from the country modules:

• Belgium — the so-called “30bis” withholding obligation, declaration of works, on-site attendance register (dyo_soustraitance_be);

• United Kingdom — Construction Industry Scheme, deduction on the labor portion only (dyo_soustraitance_uk);

• Germany — withholding on construction work payments and exemption certificate (dyo_soustraitance_de).