Problem: duplicate rows on OracleDataAdapter.fill, PKs are defined

Problem
--------------------------------------
I'm running into a problem when I call successive OracleDataAdapter.Fill
calls.
The problem is, that I'm getting duplicate rows in my DataTable object even
though I have the PKs defined on the DataTable. I've confirmed, by breaking
into the code at runtime, that the Composite Primary Key columns are on the
DataTable object.

Background Information
---------------------------------------
Using System.Data.OracleClient
I have a COMPANY_ADDRESS DataTable with a composite key:
Key Columns [ COMPANY | COMPANY_ADDRESS ]
I am using a .FillSchema call to create the DataTable in a DataSet:

private const string SQL_EW_COMP_ADDR_SCHEMA = "SELECT * FROM
EW.COMPANY_ADDRESS";

Fill Schema Code:

// Retrieve the schema information for the Company Address table
DatAdap_COMP_ADDR = new OracleDataAdapter();
DatAdap_COMP_ADDR.MissingSchemaAction = MissingSchemaAction.AddWithKey;
DatAdap_COMP_ADDR.TableMappings.Add("Table", "COMPANY_ADDRESS");
ORACMD_COMP_ADDR = new OracleCommand(SQL_EW_COMP_ADDR_SCHEMA, EWConn);
ORACMD_COMP_ADDR.CommandType = CommandType.Text;
DatAdap_COMP_ADDR.SelectCommand = ORACMD_COMP_ADDR;

DatAdap_COMP_ADDR.FillSchema(DS_EWTables, SchemaType.Mapped );

Here are the SQL Statements that are used to fill the DataTable (They return
the same row):

private const string SQL_EW_COMP_ADDR_BILLTO_SELECT = "SELECT * FROM
EW.COMPANY_ADDRESS CoAddr, EW.INVOICE IH\n" +
"WHERE CoAddr.COMPANY = IH.COMPANY AND
CoAddr.COMPANY_ADDRESS = IH.COMPANY_ADDRESS\n" +
"AND IH.BATCH = '0282' AND IH.SENT IS NULL";
private const string SQL_EW_COMP_ADDR_GENERATOR_SELECT = "SELECT * FROM
EW.COMPANY_ADDRESS CoAddr, EW.INVOICE IH\n" +
"WHERE CoAddr.COMPANY = IH.GENERATOR AND
CoAddr.COMPANY_ADDRESS = IH.GENERATOR_ADDRESS\n" +
"AND IH.BATCH = '0282' AND IH.SENT IS NULL";
.