Step-by-Step Transformer  7.5.0
General Troubleshooting > With Transformer on Windows >

Unable to Import IBM Cognos 8 Data that Contains TEXTBLOB, CLOB, or BLOB Data Types

Transformer cannot import an IQD data source from Framework Manager if it contains TEXTBLOB, CLOB, or BLOB data types. Before externalizing IQD columns or query subjects from Framework Manager, ensure that they do not contain these data types.