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Update Table supports Supported Data Types For Data Source Node. You can also support other types such as B and also supports these additional types with manual mapping.
You can manually map columns that do not have an exact data type match but the column data types have a reasonable safe implicit conversion default. For example, you can map BINARY_DOUBLE to NUMBER, or NVARCHAR2 to VARCHAR2. There could be some loss of data for such mappings:
Mapping BINARY_DOUBLE or BINARY_FLOAT to NUMBER could result in loss of precision
Mapping NVARCHAR2 and NCHAR to VARCHAR2 can result in loss of data because NVARCHAR2 and NCHAR are based on a potentially different character set than VARCHAR2. For mappings to work, your database must be set up so that NVARCHAR2 and NCHAR are based on the same character set as VARCHAR2.