Questão jurídica principal
Whether the assigned claim for architect fees was enforceable against the debtor despite the assignees having never paid the underlying invoice.
Decisão extraída
The claim was not enforceable because, on the contract's objective interpretation, reimbursement was only due once the original creditors had first paid the architects.
Fundamentação extraída
The assignment could transfer only the assignor's existing rights. The contract of 8 February 1993, read under the reliance principle, tied the debtor's duty to reimburse the architectural fees to prior payment by Y.________ and Z.________. Since no payment had ever been made, the claim was not exigible.