include all fields from a related datasource: is it possible?

[claudiobosticco]

I've got two datasources A and B with a foreign key relationship between them, say that dataSource B contains:

<field name="fk" foreignKey="A.id" joinType="outer"/>

So in dataSource B I can include fields from dataSource A:

<field name="includedField" includeFrom="A.field1" includeVia="fk"/>

given that I need to include many (actually all) fields of dataSource A, is there a way to include them all, based on the fk relationship?

the documentation for DataSource.inheritsFrom says:

...
This feature can be used for:
...
- modeling relational database joins, and the equivalents in other systems

so at first I thought I could use it, but it doesn't works this way.

[claudiobosticco]

Another question about DataSourceField.includeFrom: I noticed that it excludes customSQL, so if I mark as customSQL="true" a field with includeFrom="...", it is included anyway.
Is it a bug or intended behavior?
Tested with:
SmartClient Version: v9.1p_2014-06-04/PowerEdition Deployment (built 2014-06-04)