Why isn't Edit Taxes enabled for the AP invoice?

You will have to enable the Allow adjustments to paid invoice option to enable Edit Taxes for the AP invoice. Here's how you enable the option:

  • Sign in as an implementation consultant.

  • Go to Setup and Maintenance > Manage Implementation Projects > <your implementation project>.

  • Search for the task: Manage Invoice Options.

  • From Selected Scope, select the required business unit and click Go to the task.

  • Select Allow adjustments to paid invoice.