Error while developing Docs & API How Tos: Exporting XML Documents

I'm developing the example from the Docs & API How To's: Exporting XML Documents. I filled in the domain model as mentioned in step 1.5 including the reference set (Multiplicity [ * - * ]) between XMLDocument and Customer. Later on in the example, during Creating a Domain-to-XML mapping, step 3.12 I have to choose a Association to parent, but none will come up. When I change the Multiplicity to 1 Customer with multiple XMLDocuments, I can choose that Association. Picture shows cardinality 1 between Customers and Customer, should be 0..* instead. Later on I get stuck because this cardinality seems wrong and I can't export after all. Did anyone had the same problem or am I doing something wrong here?
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