Equaling datatype of Numeric in ssis

My DFT like as,

   Lookup à match rows take weight from SQL table

èNot matched -> add as derived column weight as (DT_NUMERIC,2,2)00.00 (need to set weight as 0)

tried data conversion task inbetween but gave error.

   Union all task -> trying to combine all rows.

But I couldn’t union the weight column. Its giving error does not match the metadata for the associated column.

In SQL table weight column data type is decimal (2,2).

Please let me know which datatype should i use to combine two dataset

Thanks