The Columns tab displays the XML views in the web service source or target definition. You can edit the precision for String and Binary datatypes, and you can add business names and column descriptions.
The default precision for the String datatype is the value at which the precision of infinite length data is set during the WSDL import process. You can set the precision for the String datatype when you import a source or target definition from a WSDL. You can set the precision for individual columns when you edit the definition.
The Mapping Designer invalidates mappings that use source and target web service definitions with a total column length greater than 500 MB.