Period Closing controls of 1 Ledger with 2 Balancing Segments

Summary:

Hello,

I have two legal entities (AB and XY). Since both entities had the same 3Cs, I made one ledger for both of them. However, this one ledger has two balancing segments. Since different people look after these two entities, I've made 2 data access sets.

I wanted to know about accounting and period closing controls. For e.g. AB wants to run it's accounting. Can you confirm if the accounting will be runned on ledger level or on the balancing segment level. (AB runs it's accounting, will this also affect XY)?

Also, AB is done with its period closing activities and wants to close its period while XY would still take time. Can AB close its periods or put a control similar to it?