How can I close the intercompany accounting accounts?

Summary: How can I close the intercompany accounting accounts?

I am in a new implementation where there are 80 different legal entities but they all have the same ledger.

Of the 80 legal entities, only one legal entity can pay and collect invoices from clients and suppliers of the other legal entities. In conclusion, all invoice payments and collections are centralized in one legal entity.

Now when the main legal entity, for example, pays a purchase invoice from another legal entity, the payment is generated by the intercompany transaction, by the balancing rule.

When the intercompany accounting entry is generated, I see that the intercompany account payable of company A and the intercompany account receivable of company B are always open.