Ask price for OP_BUY and Sell-price for OP_SELL ?

[[Deleted]]

In the documentation I can read that Buy-Orders are opened with the Ask price and 

Sell-Orders are opened with the Bid-price.

When you close the order you must take the oposite.

 

In my demo account I can start and close orders with Ask and Bid price.

I can mix it. It functioned - I get no error message.

 

Do I get problems when changing to a real money account ? 

[honest_knave]

When you close an order, you may get on better using OrderClosePrice() rather than Bid or Ask.