Strange error message when 2 def:Origin child elements

Using P21-validator 2.1.0 on a define-xml v.2 file.

I have an ItemDef with 2 def:Origin child elements. This violates the current define-XML standard where "cardinality" for def:Origin is declared as "Zero or One". So the presence of two def:Origin child elements is a violation of the standard indeed (this will probably be relaxed in v.2.1).

The message I get is however very strange. It says "Missing Origin" (DD0072) although there are 2 ones.
It should be something like "Only 1 Origin child element is allowed".