In multi-company environment, there are often the need of having a consolidated reports. Those reports are the same as the standard ones but grouped for a set of companies. The inter-company transactions should be excluded.
We could re-use the same concept as the Account Type group Account. It will be a
Meta-Account Type that groups a list of Account Type of different companies.
The reports are like "Balance Sheet" and "Income Statement" using a context which also contains a selection of companies. This selection will be used to select the types to be summed and to filter out the inter-company transactions (by overriding Line.query_get).
To identify the inter-company Moves, a new field will be added on the Move that references another company. This field will always be editable to correct the consolidate reports (just like the analytic).
The field could be filled automatically when posting an invoice if the party is another company.