Changing sales tax on a bill line updates incompletely

[sbsroc]

I created a bill through the API. The line item had sales tax on it and I wanted to remove it. After editing the bill and changing the line to "exempt" tax (at 0%), the tax is still on the bill, and the journal entries are out of balance.

[linear]

BIG-254 Changing sales tax on a bill line updates incompletely