The SetDecimal method assigns a decimal to the buffer column specified by the columnIndex parameter.
This method works with the following Integration Services data types:
If the DataType of the buffer column is not DT_NUMERIC, DT_DECIMAL, or DT_CY, an UnsupportedBufferDataTypeException occurs.
For a complete list of Integration Services data types and the corresponding Get and Set methods of the PipelineBuffer class to use with each type, see Working with Data Types in the Data Flow.