I created a script to edit the file config.xml and complete the list of values in the Configuration Matrix>User-defined Axis.
The script only add lines to the config.xml, for example:

File before:

...
<triggers class="vector"/>
<concurrentBuild>false</concurrentBuild>
<axes>
<hudson.matrix.TextAxis>
<name>MY_VALUES</name>
<values>
<string>1_First_Value/</string>
<string>2_Second_Value/</string>
</values>
...

File after:

...
<triggers class="vector"/>
<concurrentBuild>false</concurrentBuild>
<axes>
<hudson.matrix.TextAxis>
<name>MY_VALUES</name>
<values>
<string>1_First_Value/</string>
<string>2_Second_Value/</string>
<string>3_Third_Value/</string>
<string>4_Fourth_Value/</string>
</values>
...

After modifying the file and reloading the data from disk, the job disappears on jenkins.

If someone has some idea, I would be very thankful.

Thanks in advance,