‘logical system’ is used to identify an individual client in a system, for ALE
communication between SAP systems. That’s why you see a field for ‘logical
system’ in the client master data in SCC4 (table T000). You use logical systems
in ALE config – this should be documented further in the IMG guide, or SALE and
The naming convention for the logical system names which includes distinct IDs depending on:
System ID (SID), and client number, and maybe also system number if you have more than one instance per host machine. Hostname would be useful too, but I think there’s only 10 characters in v3.1x (maybe more with long name functionality in 4.x ??).
eg., in DEV box , sys no 00, client 100, choose something like ‘DEV00_100’.
The logical system must be defined or you get error messages all over the place during order processing stating the logical system has not been defined. The logical system is defined in the IMG. In 4.* it is found in the IMG > Cross Application Components > Distribution ALE > Basic settings > Logical systems > Define logical systems. Here the entry is just an identifier and a text entry.
“Logical Systems. The distribution of systems ( ALE ) makes it necessary to be able to
identify every system individually within a network. The “logical system” is
used to do this. A logical system is an application system within which the applications are
coordinated to work in one database. In the SAP sense of the word, a logical
system corresponds to a client. In the following steps, you must define every client as a logical system by first of all defining logical systems and then assigning the clients in
question to the corresponding logical systems
Note: Assignments must be unique (that is, a client may only be assigned to one
Several clients must never be assigned to the same logical system.” Reading this it does seem that it is nothing more than another identifier for a “Client”.