Commentaries: Art. 179

Any defences arising from the debt relationship are available to the new debtor as they were to the former.
The new debtor may not invoke the defences personally available to the old debtor against the creditor, unless otherwise provided in the contract with the creditor.
Where the debt acquirer has defences arising against the debtor from the legal relationship underlying the assumption of debt, these may not be invoked against the creditor.

Art. 179