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Update Table node supports certain data types. 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 exact data type matches but the column data types have 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 the loss of precision
Mapping NVARCHAR2 and NCHAR to VARCHAR2 can result in the 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.