730. Proof as to amount secured by way of mortgage.

730.     Proof as to amount secured by way of mortgage.

By agreement between the parties, a mortgage for a specific sum may be in fact a mortgage to secure a current account up to the limit of that sum, but the burden of proof is on the party who seeks to establish that it is a running security1. The actual amount due on a mortgage to secure a current account, or a mortgage covering further advances, may be proved by evidence outside the deed or by receipts on the deed2.