The database my application uses has field names containing spaces. I believe this to be the cause of my problem. Here is a typical query:
SELECT * FROM \'OV2
I don't think you can use quotes around the actual table name; only the name you assign to it. I would wrap the table in brackets instead: [OV2 BAS]
You also can't put quotes around your joining syntax either. Try this instead:
SELECT * FROM [OV2 BAS] AS bas INNER JOIN [OV2 RefID] AS ids ON bas.[Ref ID] = ids.[Ref ID] WHERE ids.ENUM_H = 'TDischarge';