This is regression in 1.5

Product field 'customizable' was marked as boolean, but it is in fact some kind of 'enhanced boolean' with three states:

• non customizable = 0
• optional customization = 1
• required customization = 2

Related to this forum thread.
https://forum.thirtybees.com/topic/6349-cannot-duplicate-articles-thirtybeesexception-property-product-customizable-is-not-valid/