Hello Reis,
If you can compare the logical databases PGQ and TAF.
PGQ is having standard view SAP, but TAF doesn't have any standard view.
In TAF dynamic selection is enabled only for table VTBFHA, but in PGQ it is enabled on many tables.
So in TAF you can enhance dynamic selection only from the fields in table VTBFHA, not from VTBFHAPO table.
So enhancing the Dynamic selection with VTBFHAPO table is not feasible with TAF. Look for any user exits or enhancements to achieve your requirement.
Regards,
Thanga