Getting value from an XML file and adding conditions to these values

Hello,

I'm trying to get the value from an xml file and then adding conditions to those values. The code I have goes something like this:

for some reason, it is not getting the value.

If the value of the field "vehiclOfNonVehiclFlag" is V, then "N° de chassis: " should appear in the "nrSerieChassisTextField" field. If it's "N", then N° de serie should appear in the "nrSerieChassisTextField" field.

Now the field just remains empty and I have no idea how to resolve this. Here is a snap from the XML file:

The field I am using, "vehiclOfNonVehiclFlag", currently has the value "V" in the xml file.

Please help

Kind regards