Validate a report gives "XQE-PLN-0001 Internal error. The query could not be pla

Hi All,

I have a report that have been created a long time ago in Cognos 8, then migrated to Cognos 10, then now in Cognos 11.
It is working perfectly fine in Cognos 10, and the validation of this report gives only a warning "XQE-WRN-0018 The dimension...