Quite often, source systems have their own ValidFrom / ValidTo fields. The lookups then need to take time into account or need a check against a fixed value.It would be more efficient to be able to specify this once at the relation level and automatically reuse for each lookup.
Currently, you can only create equal joins in a relation and then need to specify the Greater than or equal / less than side in each lookup. But if you do this, the original equal join in the lookup is removed and needs to be created again.
