Setting a Column's Required Property to False using VBA

I have the following code to append new columns to a table.  The Required property is defaulting to Yes which is causing problems when I run append queries.  How can I modify this property in code?

Dim strSQL As String
Dim cat As ADOX.catalog
Dim cnn As New ADODB.Connection
Dim tbl As ADOX.Table
Dim col As ADOX.Column

Set cat = New ADOX.catalog
Set cnn = CurrentProject.Connection
Set cat.ActiveConnection = cnn

Set tbl = New ADOX.Table

DoCmd.OpenQuery "qryCreateTblChartAll"

Set tbl = cat.tables("tblChartAll")

Set col = New ADOX.Column
col.Name = "Pd_Clm_Num"
col.Type = adVarWChar
tbl.columns.Append col

Set col = New ADOX.Column
col.Name = "Pd_Clm_Amt"
col.Type = adCurrency
tbl.columns.Append col

Set col = New ADOX.Column
col.Name = "Dnd_Clm_Num"
col.Type = adVarWChar
tbl.columns.Append col

Set col = New ADOX.Column
col.Name = "Dnd_Clm_Amt"
col.Type = adCurrency
tbl.columns.Append col
jrimmeleAsked:
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NatchiketCommented:
col.Attributes=adColNullable

note the literal value for adColNullable = 2
0

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