Thanks once Again Andre.
The requirement is to join the dimension tables of AX with tables of MR eg. MR is having tables like Reporting.ControlRowMaster ,Reporting.ControlRowCriteria . Reporting is the schema of this tables.
So it will be like for example MainAccount join Reporting.ControlRowCriteria where MainAccount .fieldA == ControlRowCriteria .fieldB and the data of this query is pushed to a custom table ABC.
This table will be further used by other applications eg. data lake.
I checked in D365 but somehow i did not find any reference to MR tables like ControlRowCriteria ,ControlRowMaster ,ControlRowDetail in Visual studio.
If I get the data of these 3 tables in AX then I don't need to connect to MR databases.
Also does these tables store any transaction data , or its just that they store the MR report design data and the data changes only when the MR report design is changed.
If I get the data then the problem is resolved :)