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Logical Databases in ABAP Release 4.0
ITOC

ABAP_MODIFICATION_NN Logical Nodes

The nodes of a logical database can have any name; the names are no longer strictly linked with the Dictionary tables. Instead, a node can have any Dictionary or local type. For example, a dictionary structure can be used for multiple nodes and a logical database can return a complex data object in one portion. New language element: NODES .

ABAP_MODIFICATION_NN Adjustment to Function Builder

The created program structure and the Logical Database Builder were adjusted to the form known to the Function Builder.

ABAP_MODIFICATION_NN Call by Function Module

The restriction that logical databases can only be used with SUBMIT is no longer valid. A logical database therefore can be used by any program to collect data. You can also call the same logical database more than once and nested calls of different logical databases are also allowed.
See documentation on the function module LDB_PROCESS.