Why is a take profit level of 3 pips rejected (scalping) rejected when trading eur/usd? What is the minimum take profit that will be accepted?
As far as I know - it depends on the broker.
The minimum distance for both stop loss and take profit is specified by your broker. For your orders to be executed (=under avoidance of an invalid
stops error) you either need to look up the min. distance for this specific symbol from your brokers website or you also should be able to get
this value via SymbolInfoInteger(Symbol(),SYMBOL_TRADE_STOPS_LEVEL)*Point().
You can't move stops (or pending prices) closer to the market than the minimum:
MODE_STOPLEVEL * _Point or
SymbolInfoInteger(SYMBOL_TRADE_STOPS_LEVEL).
Requirements and Limitations in Making Trades - Appendixes - MQL4 Tutorial
Requirements and Limitations in Making Trades - Appendixes - MQL4 Tutorial

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