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Blockade of placing further orders on the same currency pair

Hello. I am asking for advice. What's wrong here. How to block the submission of the second and the next order on the same currency pair . Below is the code: //+------------------------------------------------------------------+ //| Sprzedaj USDJPY.mq4 |

Placing orders in the demo.

Hello. I will ask for help. Why this script does not place orders. //+------------------------------------------------------------------+ //| Poziom i spadek.mq4 | //| Copyright 2019, MetaQuotes Software Corp. | //|

Trailing stop- Why compiler print 'OrderModify' should be checked.

Hey. I will ask for help . Why compiler print "OrderModify" should be checked ? //+------------------------------------------------------------------+ //| USDPLN expert pozostałe .mq4 | //| Copyright 2019, MetaQuotes Software Corp. | //|

If

Hello. I will ask for help. What's wrong here? if (High[ 2 ]+ 0.0001 ==Low[ 1 ] && Close[ 2 ]+ 0.0001 ==Open[ 1 ]&& 2 *(Close[ 2 ]-Open[ 2 ])<Close[ 1 ]-Open[ 1 ]&& Close[ 1 ]-Open[ 1 ]> 0.0025 ) This is the code for USDPLN . Why is it not working? Below is the whole code