How to log Document Type child fields

Hi people. I want to ask you if you know how to log fields from documents references that are into another Document Type, in the same BAM_FACT_… table.
For example, we have a Document Type called Solicitud (publishable) and it contains another Document Type called Producto, which has two attributes: ID and Descripcion. When the system creates the BAM… table it creates only the BAM_FACT_SOLICITUD… table without Producto attributes.
Do you know if it is possible to do it?
If not, the only way to do it is creating all the attributes into the parent Document Type?

Thanks in advanced,