SAP Service Layer Missing Many Columns

The SAP Service Layer seems to beryllium missing a ample magnitude of fields, rendering it hard to usage arsenic a replacement for the DI API.

For example; conscionable immoderate of the pursuing are missing from Document Lines:

- All Target Document info (TrgetEntry, TargeType)

-  Some Base Document info (BaseRef, BaseAtCard, BaseCard)

But from what I person seen, each entity is missing a decent magnitude of fields available.

Is determination a crushed for this limitation? Is the lone mode to enactment with this to conscionable usage SQLQuery?