So your filter line is
<Filter name="process_code" criteria="EQUALS">process_code</Filter>
and not
<Filter name="process_code" criteria="EQUALS">bcc_alta_evolutivos_v10_f1_2</Filter>
Just wondering how does it pick
<KeyInformation><column name="process_code">bcc_alta_evolutivos_v10_f1_2</column>
for the error message then?
The reason for asking about the rights is that apparently the it is recognized that you want to read a particular process, but that fails. Rights could be one reason. But if your admin has process view and edit and XOG rights and not just rights to administer the system that should not be the problem.
Have you tried without the line
<?xml version="1.0" encoding="UTF-8"?>
???