Kernrechtsfrage
Whether the bank's fax constituted a valid acceptance of an assignment binding it directly to the contractor.
Extrahierter Entscheid
Yes. The fax could be accepted before formal notification of the assignment, and in the concrete circumstances the contractor could rely on the bank's acceptance without an express reserve of sufficient coverage.
Extrahierte Begründung
Under Art. 468 CO, acceptance creates a direct abstract debt. The general rule is that an assignment of a debt is normally understood to be conditional on sufficient coverage at execution, but the principle of trust governs. Because the bank knew the contractor had suspended work and induced resumption by its confirmation, a reserve of lack of coverage had to be stated clearly and expressly to be opposable.