[Koha] the definition of AllowOnShelfHolds?

[justin fang]

I have a question regarding the option "AllowOnShelfHolds".
With the option, we will able to disallow hold requests to be placed on
items that are not checked out. But in case of multiple items for one
record, the rule seems not work. For example, we have 3 items for one
record, one of the 3 items was checkout. User will be able place a hold on
the item even 2 of them are not checkouted. Is this correct behavior?

Thanks,
Justin