It means that the account type of your cTrader is “Netted”.

In this case, all orders on the same symbol will be put into 1 position, thus making it impossible to have multiple positions on the same symbol at the same time.

If you wish to change the account type to “Hedged” where you can hold multiple open positions on the same symbol at the same time, you may need to contact your broker.

Some brokers do not offer options(hedged or netted) thus traders are not able to choose account types.
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