Baranski Jocelin,
First of all, please understand that this is an English language forum so please translate before posting. I used Google language translator to get an idea of what you are asking.
What version of Project are you using? Is it a desktop version (i.e. stand alone or desktop client) or Project Online or Project for the Web?
Generally, attempting to import Predecessor fields from Excel to Project is tricky because the Predecessor IDs must track exactly with the outline structure of IDs in Project.
Also, you mention a consolidated project and that tells me you are likely using a master/subproject (dynamic) structure. The task IDs in a dynamic master are not the same as those in a "flat" Project file. The task IDs shown in a dynamic master are those of the individual subproject files, not those of the master. That means you will not be able to do a simple import of predecessor data from Excel to Project without the use of some VBA.
John