We are trying to disable tax applicability in Receivables for Invoice event class , recently we upgr

The below are the steps we are following to disable ebusiness tax applicability for receivables but still zx is being called , Please suggest

1. Login into Tax managers responsibility
2. Click on Defaults and Controls --> Configuration Owner Tax Options
3. Find the event class tax options by entering the operating unit and application = “Receivables”
4. Click on each event class option, and enter an end date for them and click Apply.
5. Go back into Defaults and Controls à Configuration Owner Tax Options
6. Click on Create button and chose Application as Receivables and for enter an event class and
   turn the Allow Tax Applicability = No. Click on Apply