The happening of a resolutory condition has the same effect on the creditor as the happening of a suspension condition has on the debtor - an obligation arises. The fulfillment of the resolutory condition converts the creditor into debtor, and the debtor into creditor. Hence, the applicability of the provisions of Article 1189 in case of loss, deterioration, or improvement of the thing. Pending the fulfillment of the condition, the parties are entitled to the rights granted by Article 1188.