Resource availability conflict - Project doesn't show me!!!

[Wim]

In a MS Project project, I have set up resource calendars of all team
members, with their availability. I then added a 5 days workshop as a
task ("fixed duration"), to be attended by all team members (100% of
their time). However, one member of the team is NOT available during
these days, as indicated in his resource calendar.

How does MS Project warn me that there is a conflict?

- In the Gantt chart no conflict is indicated,
- In the Resource Graph, his work load for those days is of course
zero, but without a warning in red that he actally was expected to be
there! I would have expected in this Resource Graph that his required
attendance to this workshop was indicated in red: a 100% bar in red,
being 100% required, but 0% available.

Please help.

Wim
Durban RSA
MS Project 2003 SP1
WXP