Some building blocks are not supported for every engine. Different trading platforms have different features, and some features are supported only on particular trading platform.

Because of this there are some blocks or parameters that are not supported on some trading engines.

Such blocks/parameters are indicated by red flag as in the example below:

This means that block Draw Down Arrow is not supported for EasyLanguage (Tradestation and MultiCharts engines). When creating strategy for one of these engines you have to avoid unsupported blocks,