Diagnosis
With a client-specific table, the SAP System expects the field whichdescribes the client to be in the first position. The leading keyposition of the client field restores the hierarchical dependency ofthe data on the client.
If the client field is not set in the first position of the tabledefinition, selection of such small datasets leads to a comprehensivetable scan, which has a considerable effect on performance.

System Response
If the client field is, nevertheless, not specified in the first keyposition, the table is activated but is not identified asclient-specific by the ABAP/4 Dictionary, i.e. you do not have anySELECT support for this table in ABAP as with client-specific tables(the client is thus not automatically ascribed).