One check is drawing on bank account across two Companies

Summary

A check drawn on one company is posting against the bank account on two companies

Content

We have two companies, one is essentially a spin off from the other, so there are a lot of suppliers who still bill one of the companies, but do not yet bill each separately.

When we have AP invoices with expenses for both companies we will enter it as one company 10 invoice but code the expenses to both company 10 and company 30.  This will create intercompany/eliminating AP/AR entries, which work ok.

When drawing a check to pay this invoice it is drawn fully on company 10.