неустановленная сумма(n unspecified amount of money is one which is not precise. For example, if you are claiming damages (compensation) for loss or injury, you might not be able to work out exactly what those damages are [worth]. LT Alexander Demidov)
иск без заявленной цены(A claim where the amount to be awarded is left to the Court to determine, e.g. damages to be assessed for personal injuries. Previously known as an unliquidated claim. LT Alexander Demidov)