Sec 128A - Waiver of interest and Penalty - Goods and Services Tax - GST

Dear Experts, One of my clients had received GST Order wherein the tax demanded was already paid while filing Annual Returns. We had gone for Appeal and it is pending for disposal. Now, can we opt for Amnesty Scheme under section 128A , as the tax demand has been paid and seek waiver for interest and penalty? When we tried filing SPL-02 , the DRC-03 through which we paid is not reflecting as we have paid by giving reason as Annual Return . In case we can opt for Sec 128A , how can we file Form SPL-02 in this scenario?