Column name is not a unique identifier, so column number is used to access table cell data. According to UFT User Manual object.GetCellData( row, column) arguments are long integers, the row and the column numbers where the cell is located.
Use GetCellData like this:
Browser("Browser").Page("Page").Frame("searchDialog").SAPTable("ResultsTable").GetCellData(1, 1)
Browser("Browser").Page("Page").Frame("searchDialog").SAPTable("ResultsTable").GetCellData(1, 2)