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If IsNull(Evaluate(This.Column4.ControlSource))
This.ReadOnly = .t.
Else
This.ReadOnly = .f.
This.column1.ReadOnly = .f.
This.column2.ReadOnly = .t.
This.column3.ReadOnly = .t.
This.column4.ReadOnly = .t.
This.column5.ReadOnly = .f.
This.column6.ReadOnly = .t.
EndIf