Busy time problem

Scenario:

One user has scheduled a meeting for June 8th 11:00 to 12:00 himself as chair person. Now he is creates another meeting for the same time slot with himself as chair person again. Saves this document as draft.

Problem:

When user opens the draft document and checks his availability by clicking on scheduler, it shows 11:00 to 12:00 as free though he is chairing a meeting for the same meeting.

Supplimentory Observation:

Alternatively if user creates new meeting document and checks schedules for the same timings, it shows him as busy!

Hope somebody should be able to help me out, though I tried to convince the user to go for second option!