Upon uttering the command word the Air Armor spell springs into being

Now I know it is quite possible to enchant such an item, but my problem is that she wants to use it using the Create Commom Item knack to do so. As a reference my wife is using a quote from EDPC p155 Enchantment Types, Common items ....
"Occasionally, magicians create minor magical items by using a spell pattern as the basis for the common item’s magical pattern, allowing the item to show effects similar to that of the spell used."
I say yes you can use spells to create spell like effects but only, as per the example of the Bedroll of Comfort, only to create Common items listed in the Good & Services section (or something very similiar).
What is the correct interpretation

Cheers, Chris