Regarding data, why do the same investment vehicle have different 'id' for different dates?

Why would the same investment vehicle have different id for different dates? Is it so that we can’t identify the change in price over time for that investment vehicle? It’s not clear why that information needs to be hidden.

Hi fine-james,

This information is hidden so that the investment vehicle cannot be identified by retro-engineering, and protect the proprietary data associated to it.