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You need to create a syncmapping extension for Host_ComputerSystem and not use this same syncmapping name here.
Read Extending the CDM mapping - Documentation for BMC Discovery 11.3 - BMC Documentation where you luckily have an example around Location.
Even though you presumably only expect on location, you need a for each loop to visit the traversed-to nodes:
for each loc do
Indeed, it was that.
The doc given by Brice also state : "The name defined by the traversal can only be used in a for each expression; it cannot be used in any other context."
Thank you both.