Error 208 : No such child with @XMLXPATH

I am confused about using XML parsing. The appended file (which is in fact an xml file) represents an electronic invoice used in my country starting by this year.
I am trying to extract some info from that file. Such as the string 53484421 which is the tax ID.
I am using the TCC console :
<<echo %@XMLHASXPATH[cac:AccountingCustomerParty/Party/PartyTaxScheme/cbc:CompanyID]>> returns 1.
Instead @XMLXPATH returns <<TCC: No such child.>> Quite annoying.
But the surprise comes (at least for...

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