Maybe if I read the user's manual, I could answer my own question:
page 4 :
If you use REALbasic Standard then you need disable RBDB features of
V4RB, because
RB Standard do not allow use them. To do this you need just create
any file with name
DisableRBDB inside of plugins folder of REALbasic. In this case items
in the menu "Add
Data Sources" will not present and you can use only classes of V4RB.
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