In order to avoid spamming of small and irrelevant orders CEX.IO has imposed limit on minimum trade prices for each trade pair.
GHS-BTC pair limits the price per GHS at 0.0001 BTC
GHS-USD pair has a minimum price per GHS as 0.00000001 USD
You may check the limits on other trade pairs on the trade page by selecting the desired pair and placing an order.
Placing order under the limited price will result in an alert error message which will be displayed on the screen as:
Thanks for your understanding over this matter.