When using stackable validation inaplicable Redeemable does not contain in status error object

[duchacekjan]

I am calling stackable validation and when I get result back I am not able to retrive error message why is it inapplicable. By doc here: https://docs.voucherify.io/reference/validate-stacked-discounts in response under Redeemables[0].Result contains only Discount amount and missing error object