6i Migrated Reports are running in 10g Reports release, but the displaying is partial

Hello,

I got several 6i reports migrated to the 10g release. The most are running as normal, but several of them aren't. Part of the report is displaying well: labels/texts, lines, but other elements are not.

Maybe, I think, I should change some coding lines or some incompatible used built-in or something like that, in order to see the report displayed entirely.

 So, my question here is: is there some manual or guide about the troubleshooting in Reports 10g when migrating from 6i release?

Thanks in advance,

ErnestoNR