Strategy works correctly in a usual mode, but as a part of the Combination transactions vanish. Transactions on revers on the same bar.
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First of all, upgrade from 6.4 to 6.5 which fixes a couple bugs in Combo strategies.
Next, how can this be reproduced? A one line description is not enough. Give us something to work with:
1. Strategy code
2. All Combination Strategy settings
3. Single symbol or Multi-symbol mode, Position Sizing, and Data Loading settings
3. Options (F12), especially from the Trading Costs/Control group
4. Symbol(s) and Data provider
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