1, version is too old: Lotte app version is too old, and it needs to be updated to the latest version to use the reservation function.

2. Abnormal account number: Due to abnormal account number or violation of relevant regulations of Lotte Mall, the account number is prohibited from using the reservation purchase function.

3. Not at the scheduled time: the function of purchasing goods by appointment is limited to specific goods or within a specific time period. If the selected product does not support reservation purchase, or it is not within the reservation purchase time, this function cannot be used.