When I requested 'Historical Instrument' for 7974.T with REST API, I got a response below.
There are two blocks first of which contains DomainCode 6 and its dates start from 1996. Whereas the last one has DomainCode 8 and the dates are from 2015-08-17.
I wonder that the difference is and what impact I have on using them.
You can refer to this question. The DomainCode can be used to determine which report template can be extracted. For example, if the RIC supports DomainCode:8 (Market By Price), the RIC can be extracted by TickHistoryMarketDepth report template with View: "RawMarketByPrice".