I think I found my problem.
The conditions for the Extended Calendar is
MNTHD#15 | EOMWORK
not
WORKD#15 | EOMWORK
This one was giving me the 15th WORK day which was the 19th or 20th day of the month excluding the weekends.
In order for this to work, I still have to load a holiday calendar and select the "Schedule on the previous workday" and on the same on the Non-Workday Action (no calendar needed).
I hope this helps someone looking to use extended calendars in WAAE R11.3.5
Sincerely,
Taz Uker.
On Wednesday, March 27, 2013 11:36:54 AM UTC-4, tazuker wrote: