why download another symbol history data?

 

I just do backward testing of EURJPY but the tester download USDJPY's history data. Why?

 

And when I test EURGBP, it download GBPUSD.

 

when download finished, the tester stop everything.

 

journal:

2010.08.08 12:40:49 Core 1 disconnected
2010.08.08 12:40:49 Core 1 GBPUSD: history downloading completed
2010.08.08 12:28:45 Core 1 GBPUSD: history downloading started
2010.08.08 12:28:45 Core 1 GBPUSD: symbol synchronized, 3304 bytes of symbol info received
2010.08.08 12:28:45 Core 1 GBPUSD: symbol to be synchronized
2010.08.08 12:28:45 Core 1 EURGBP,M15: testing of Experts\song4compete2010.ex5 from 2009.01.01 00:00 to 2010.01.01 00:00 started
2010.08.08 12:28:45 Core 1 EURGBP,M15: every tick generating
2010.08.08 12:28:45 Core 1 EURGBP,M15: history begins from 2008.01.02 10:00
2010.08.08 12:28:44 Core 1 EURGBP,M15: history cache reserved for estimated 50125 bars
2010.08.08 12:28:44 Core 1 EURGBP: contains 304821 M1 records of beginning data from 2008.01.02 10:00 to 2008.12.31 19:59
2010.08.08 12:28:42 Core 1 EURGBP: history synchronized from 2008.01.02 to 2010.07.30
2010.08.08 12:28:42 Core 1 EURGBP: load 27 bytes of history data to synchronize
2010.08.08 12:28:39 Core 1 EURGBP: symbol synchronized, 3304 bytes of symbol info received
2010.08.08 12:28:39 Core 1 performance: 54
2010.08.08 12:28:39 Core 1 64 Kb of total initialization data received
2010.08.08 12:28:39 Core 1 successfully initialized
2010.08.08 12:28:39 Core 1 initial deposit 10000.00 USD
2010.08.08 12:28:39 Core 1 expert file added: Experts\song4compete2010.ex5. 37880 bytes loaded
2010.08.08 12:28:39 Core 1 76 bytes of selected symbols loaded
2010.08.08 12:28:39 Core 1 7162 bytes of tester parameters loaded
2010.08.08 12:28:39 Core 1 3764 bytes of group info loaded
2010.08.08 12:28:39 Core 1 3124 bytes of account info loaded
2010.08.08 12:28:39 Core 1 common synchronization completed
2010.08.08 12:28:38 Tester EURGBP,M15: testing of Experts\song4compete2010.ex5 from 2009.01.01 00:00 to 2010.01.01 00:00 to be started

 

Documentation on MQL5: Market Info / SymbolSelect
  • www.mql5.com
Market Info / SymbolSelect - Documentation on MQL5
 
 
similar here, testing MACD sample GBPUSD .the tester says downloading EURGBP , EURUSD and GBPUSD
 

I had hide gbpusd in "market watch" before test, but it display again after the testing, that's supernatural...

Reason: