Questão jurídica principal
Whether the 9 December 1997 letter constituted a guarantee/patronage undertaking under Art. 111 CO
Decisão extraída
The letter was only an informational statement about the branch's registration and management; it did not contain any promise or assumption of an obligation by B SA.
Fundamentação extraída
Applying the reliance theory, the text was clear and, in context, merely confirmed the branch's existence and activities. No serious reason existed to depart from the wording, and the internal documents not shown to B SA did not alter that interpretation.