The maxim cum certum est an et quantum debeatur means when it is certain whether (anything is due) and how much is due. A debt is liquidated when it is rendered certain what is due, and how much is due--cum certum est an et quantum debeatur. [Bartee v. Andrews, 18 Ga. 407 (Ga. 1855)]. For although it may appear that something is due, if it does not also appear how much is due, the debt is not liquidated. [Roberts v. Prior, 20 Ga. 561, 562 (Ga. 1856)].