[Koha] repeatable subfields in items

Hello does anybody try to set holdings subfields (952) repeatable? for example notes 952$z OR 952$x OR 952$u I know that some subfields $a,$b,$y can't be repeatable. I tried it in simple demo and it works, but I am afraid if there will be some issues during circulation and other proceses do you have any experience with repeatable hoding subfields? thanks Viliam