Dataset error in BCB6

I have a report with 2 datasets (the second is a slave).
In the report, a MasterData Band use the master dataset.
When I want to access to a field of the slave dataset, I have an error message when generating the report...
If I put my slave dataset as the report dataset, and re set it to NULL, its works...
It seems that it misses an action to automaticaly open the slave dataset...

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