Holidays Set contains ambiguous rules
Messages > Design-Time Messages > International >
Source : aeiou-Holidays, Included Holidays, Holidays Override or Saints/Namedays Options.
This message, introduced in September 2007, is meant as a reminder that the Weekdays part of a holidays recurrence rule is processed before the Offset part of that same recurrence rule.
Recurrence Rules options in the left to right order in which they are handled
This message will no longer be generated starting in October 2011.