Hello Kris,
Maximum Character Stream Size defines "Maximum size of a text stream (for
example: HTML, XML) that will be transferred to the application server". If a text stream sent to the application server is greater than this limit, the generation is stopped to protect the server and an error is returned.
A temporary file (*.xml) is generated and when size of the xml file is greater than the Web
Intelligence Processing Servers "Maximum Character Stream Size" setting, the error will be thrown.
You can increase the Maximum Character Stream Size because the default is low
Increase this value in the Central Management Console (CMC).
I hope this helps.
Cheers,
Fadoua