Updating SQR include files using API calls

Has anyone had any success updating an SQR Job to setup/amend it's include files using API provided by Oracle.

I have a Java class that performs, basically I copied items out of SDK sample addDocument.

SQRJob sqrj = repository.getSQRJob('/mysqrfiles/mysqr1.sqr');

sqrj.setDescription('whatever')

sqrj.setIncludeFiles(new DataObject(0));   // remove current include files

sqrj.update();

Now I would like to add new include files but I cannot seem to find a good example on how to achieve this.

I tried

DataObject obj1 = (DataObject)repository.getObjectbyPath('/myincludes/includefile1.inc');

sqrj.setIncludeFiles(obj1);

This fails.

Any help approeiated as Oracle support will not assist as they state API is not covered by Customer Support Service.