Overview: The element Material type in the Item record, has been defined as a Required, Not repeatable element, while it has been associated with loan rules, display in result list etc. The current solution have lately been evaluated, and the MM-SIG plan to initiate a review/discussion at the upcoming WolfCon meeting in January 2020.
1) At WolfCon discuss/review our current implementation having the Material type in the Item record, being a Required, Not repeatable element
2) Analyze the impact on other apps when changing the element Material type to be: Not required, repeatable
3) Decide to implement this (knowing this is a breaking change in the back end) - POST MVP.