How to modify project expenses ?

I found all these datas are managed in table 'planningelement', and for the project with problem, field ValidatedCalulated was '1'. I modified it in database and can now modify validated expenses.
I don't know how I managed to get this (since I don't have any sub-project, but perhaps I had during tests?) and don't succed to reproduce. If I get it again, I will create a new post then.
Thanks.

It seems that if you attach a sub-project to project P, field then becomes grey (which is normal).
But if then you attach sub-project to another project, project P still stay with field in grey (which is no longer OK).