Actually, there was one of those giant flame-war-like arguments about whether the ability score requirement depends on the spell's level on the Cleric list (almost certainly what was used for making the scroll) or on the Ranger list (the class that allowed Belkar to use the scroll). Using the Ranger list for this would require 14 wisdom after the buff, leading to a clear contradiction, but a sizable faction (including the person who at the time was maintaining the first post) was quite firmly convinced that the rule was not ambiguous at all and that using the Ranger list was the only correct reading of RAW.
Thus, the decision to not use that incident as evidence for Belkar's wisdom.