Ignored constraints on non linear problem

Thank you for that quick answer.

What does Xpress mean by unfeasible? When i gave him a part of the solution it is able to give me what i'd expect. (It's what i explain about x(1)=0). He should be able to find at leat that very solution.

I'd like to try to update it first, unluckily, because i'm a student and i'm using the university license, i'm not able to do it by myself. I'll look forward with the IT departement if we can update it. I'll try the function 'getprobstat' as soon as i could, but it's holyday time so i can't do it for now, i'll keep you informed about the results.