anybody been able to set the price level as Custom in 2.0: I have tried the following:

cash_sale.setSublistValue({
                sublistId: 'item',
                fieldId: 'price',
                value: '-1',
                line: 0
            });

cash_sale.setSublistValue({
                sublistId: 'item',
                fieldId: 'price',
                value: -1,
                line: 0
            });

But I keep getting You have entered an Invalid Field Value -1 for the following field: price