Surpress automatic entires in symbol mappings when opening a chart

Every time a chart is opened an automatic entry will be done in the symbol mapping table for the symbol in the chart.

If the data feed and the broker are different providers (for example, Tradestation for the data feed and Interactive Brokers as the broker), then the automatic entry in the symbol mapping table is incorrect and also causes error messages. The wrong entry can be deleted in the symbol mapping table, but it is immediately added again when a new chart is opened. Therefore, it would be very helpful to have a function that suppresses the automatic entry in the symbol mapping table.