Example 7 - Unrealised Profits - Chapter 23

Hi, I had the following question regarding example 7: At the time of sale of inventory of $120,000, both parent and subsidiary would have created receivable and payable at the time of sale. Why didn’t we reverse that since they would have created intra company balances? Kindly confirm why we didn't do so. Waiting to hear from you. Kind regards, Aayush Shah