rec/client is a SAP Parameter attribute which is used to control Activate/Deactivate table auditing information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter can be used to activate or deactivate table auditing
specific to the client. The setting of this parameter determines whether
write operations on certain tables (flagged appropriately in their
technical settings in ABAP Dictionary) are logged in all clients, some
clients, or not logged at all.
OFF Table auditing is deactivated, which means that no writes are
logged, even if table auditing is activated for certain tables in ABAP
Dictionary.
ALL Table auditing is active for all clients, which means that all
writes performed on tables are logged that are flagged accordingly in
ABAP Dictionary.
<(><<)>client1>,<(><<)>client2>,...,<(><<)>clientN> (1 <(><<)>= N <(>
<<)>= 10) Table auditing is only active for the clients in the list. Up
to 10 (different) clients can be specified. Caution: No blanks can be
inserted before or after the ',' separator in this list.
Wrong
rec/client=001, 002 , 003
Right
rec/client=001,002,003
See SAP Parameter Documentation for full SAP documentation for this profile parameter.