CSV loading subreport doesn't show in Detail Band

Hello

 

I'm findnig some problems when loading a subreport through generating a CSV file via Java. If I place the subreport in the Column Header, the data loaded in the subreport through the DataSource CVS shows correctly, but if the subreport is in a Detail Band, this one won't render at all. The preview option within iReport Designer works fine with both options, but if I try to generate the PDF file within my Java app fails to render anything in a Detail Band.

 

Any help would be appreciated.

 

Thanks a lot.

D.