UML14 — Question on Connectors - fig 2-17

On fig 2-17, the left-hand of the diagram shows Order with two interfaces,
OrderableItem and OrderEntry. On the right hand, the assembly connector
lists only OrderableItem. Yet, the text above -

"When this notation is used to connect "complex" ports that are typed by
multiple provided and/or required inter-faces,
the various interfaces are listed as an ordered set, designated with

or

if needed."

might be interpreted as indicating that on the Order side of the assembly
connector, the adornment should read "OrderableItem,OrderEntry" (as an
aside, the text above seems to indicate that this list is ordered, but I
don't know what the order should be). There are a number of possible
explanations for the current figure:

• It's a mistake and both interfaces should be listed;
• Only interfaces supported by both sides of the connector need to be
  listed, (but how about compatible interfaces that are not related by
  classification?)
• The text above does not apply to parts, but that seems unlikely -
  they are connectable elements after all and can implement and use multiple
  interfaces
• Something I haven't though of

Can someone please enlighten me?

see above, resolved