If the contracting party, at the time of concluding the contract, does not declare that they are contracting in the capacity of a representative, the effects of the contract shall not be attributed to the principal, whether as creditor or debtor, unless it was necessarily to be presumed that the person with whom the representative contracted knew of the existence of the representative, or it was immaterial to them whether they dealt with the principal or the representative.
Interpretation and application must be checked against the official text and current version.