The case is, that when a MRB case is created for a specific lot/batch on a Handling Unit in the Inventory Part in Stock view,  and you want to disposition the lot/batch , you wantt to split the lot/batch on two Handling Units in order to create two different disposition lines, where a part of the lot/batch can be used as it is, and the other part needs to be scrapped. 

It is possible to split the batch on two handling units on the inventory part in stock view, but it is not having any effect on the MRB Case, it looks as though the hole lot/batch is still on the same handling unit. I cant refresh or update the MRB case in any way.