Re-adding a deleted dataset does not import relationships

[GaryFisken]

If I have a model with some data sources and then add a DirectQuery to another existing dataset everything looks as expected. That data model is added to the first and its relationships and measures are maintained. If I then proceed to delete the connection to that dataset, all tables from that dataset is removed. So far everything works as expected.

But if I now realize I do want to have that connection again and add it to my existing model again, it does not work as expected. All the tables are added but they have no relationships this time. This is, of course, not what you want if you connect to a complex dataset.

Steps to reproduce:

1. Start with an existing data model
2. Create a DirectQuery connection to a live dataset. Observe that relationships in imported tables are maintained.
3. Delete that Data Source from the current file.
4. Create a DirectQuery connection to the same live dataset. Observe that imported tables have no relationships.

[v-chuncz-msft]

@GaryFisken 

You may save the file and reopen to connect the dataset.

[GaryFisken]

@v-chuncz-msft 

Thank you, that seem to work. So you are not completely breaking your file by adding a dataset then. I would still consider it a bug, however.