You found the right path. In the worksheet (Part I, line 4b), if the software won't accept a $0 in a denominator (column c), entering $1 is the standard "tax-pro hack."
Why it works: $0$ divided by $1$ is $0$. It satisfies the software's need for a value while ensuring that exactly $0.00$ of interest is allocated to your foreign income. This preserves your full Foreign Tax Credit.
Please, let us know if this works and help you move on with your return.
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