Document type <document type name> contains field <field name>, which is of an unsupported datatype.
You tried to import a document type as a webMethods source or target definition. However, the document type contains a field, which uses an unsupported datatype. As a result, the Designer could not import the source or target definition.
Make sure that any document types you want to import as webMethods source or target definitions contain fields that use datatypes that PowerCenter supports.