> For the complete documentation index, see [llms.txt](https://docs.alt.town/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.alt.town/user-guide/dna-trading/order-rejection-and-cancellation.md).

# Order Rejection and Cancellation

## **Order Rejection**

To protect investors and prevent unfavorable executions, the following orders will be rejected upon submission:

* **When the total amount of the order submitted by the user is as follows:**
  * Orders where the total amount is less than the minimum order amount
  * Orders where the total amount exceeds the maximum order amount
  * If the total amount of a specific Alt DNA held during the entire pre-sale period exceeds 10,000 DNA

***

## **Market Order Rejection**

Market orders will be rejected in the following cases:

* **For market buy orders, if the total order amount exceeds the total amount of sell orders pending in the top 15 ask prices.**
* **For market sell orders, if the order quantity exceeds the total quantity of buy orders pending in the top 15 bid prices.**

***

## **Order Cancellation**

* **User-Initiated Order Cancellation**

  Users can cancel their orders directly before they are executed.
* **Exchange-Initiated Order Cancellation**\
  Alt.town may cancel user orders after notification in the following cases:

  * Termination of DNA trading
  * Change in Alt name
  * Service maintenance  (During service maintenance, the following orders will be canceled to protect users' assets.)\
    \- Buy orders with prices higher than the last execution price just before the maintenance begins.\
    \- Sell orders with prices lower than the last execution price just before the maintenance begins.

*🌟 Events such as DNA trading termination, service maintenance, etc.*