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When an XY event is created from a Microsoft Access database using an OLE DB connection in ArcCatalog, you may see inconsistency in your ability to set these themes as a selectable layer.
The tables stored in Access do not contain a field that ArcGIS can use as an internal ObjectID.
Create a new field called AutoNumber in the table containing the XY event values, using Microsoft Access. This field will act as an ObjectID field for ArcGIS.