Consider the following extract from Case 12 - 2 Mair v. Bank of Nova Scotia:

"To constitute an apparent alteration within the meaning of the Bills of Exchange Act it should be apparent upon inspection of the bill that its text has undergone a change. The document itself must show that some revision of the text has taken place and its appearance must be consistent with the revision having occurred after completion or issue, although it may also be consistent with the revision having occurred before completion."

Using your knowledge from Week 11 - Financing International Business and with reference to the case above, explain where the burden lies for determining the validity of an endorsement if it is deemed ineffective under Common Law.