Crosstab measure become null when a report running on JasperReports Server (4.2)

I've created a report with a crosstab and used a measure for sum a specific field, when I run this report
Directly on iReport the values were show Ok, but after I uploaded the jrxml file to a JasperReports Server and executed
again the same report, the measure field stayed null. Anyone knows why?

tks