Hi Snjezana.
Thanks for your answer.
I did what you told me but now I have the following error:
GRAVE [org.jboss.tools.birt] the value of parameter FechaInicio is invalid: org.eclipse.birt.core.exception.CoreException: Can not convert the value of 2011/08/01 to Date type.
I defined "yyyy/MM/dd" as the date format in the report.
Thanks.