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How to count pairs in basket MQL5

Hi i need to count how many pairs has opened positions on my account. It can happend that one pair has more than 1 trade open and in that case must be counted one time only. Thank you

Disable trading in Holydays period

Hi, I would like to avoid my expert (developed in mql5) to trade during a certain period of the year (from 23 Dic to 08 Jan every year). Is that possible? Thank you for you help

Automatic validation error

Hi I'm trying to publish my EA to the market but the automatic validation gives me an error, in metaeditor its all ok 0 errors and 0 warnings. Can somebody help me? Thank you test on EURUSD,H1 (netting) 2016.04.01 18:59:40 failed instant buy 0.01 EURUSD at 1.13853 [ Invalid volume ] 2016.04.01