TargetStrategyPerformance(850) deprication

Imported from previous forum

Since we’ve deprecated TargetStrategyParameters(848) we should also consider depricating TargetStrategyPerformance(850) and replacing it with a repeating group as well.

I think FIXatdl can be extended to allow brokers to describe the performance metrics they will send back to their clients. This could add some value to their algo offerings.

-Greg