UBL Documents - Tax Identification Code

[Estibaliz Olaechea <olaechea.estibaliz@gmail.com>]

Hello, 

I'm working on an UBL project (in Spain), I have to generate UBL documents (Order, Despatch Advice and Invoice), so I need information to do this correctly.

So my particular question is, what's the difference between PartyIdentification field and CustomerAssignedAccountID field?, on which one goes the Tax Identification Code (CIF, in Spain)? Is there any rules about codes from Spain?

Where can I find examples of Spanish UBL Invoice, Order or Despatch Advice?

Thank you very much

Regards,

Estibaliz Olaechea.