1.If the original formal instrument exists, its official copy shall be legally valid to the extent to which it is a carbon copy of the original. 2.A copy shall be deemed official if it is a photocopy of the original, in accordance with the governing procedures. 3.A copy shall be deemed a carbon copy unless one of the parties challenges the same. In such case, the copy shall be examined against the original instrument.
Interpretation and application must be checked against the official text and current version.