Thanks Rohit,
No, there is no any invalid content . In addition to the error message , I should have told you that the xml files are being writed by the PI system server in a Web MII workbench folder . I can not see any xml files using the workbench, but when I look at the file system they exist !
Applying your suggestion, I copied the xml content from the xml file which can not been read by the MII transaction ( the prolog error message ) to an xml file created at the workbench, and there was no problem using the same transaction against that xml file !! . The content is the same ! ¿ How come ¡?
Please help me out .
Best regards,