Hi,
I am unable to enter a tax line as the tax rate code Lov is empty.
I selected required on the tax field at header level.

I completed the following setups:

Tax Regimes;Taxes;Tax Statuses;Tax Jurisdiction;Tax Rates
Configuration owner as Global

GL Tax options:

configuration owner :
two choices- My OU and LE
Completed the setup with LE
But for OU, the tax field is empty
System Profile : GL resp mapped to OM: Operating Unit
Any idea why GL journal line- Tax rate code is empty and what else can be done?
Regards

There are so many factors that can cause this issue. Could you please try again verifying your setup with mine and see if you can find out anything missing in your setup. Otherwise please upload your configuration screen shots.