stat/rfcrec is a SAP Parameter attribute which is used to control Max. number of rfc statistic records for one statistic record 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 .
You can use the parameter stat/rfcrec to activate the RFC statistics
within the SAP statistics. This allows you to enter the RFCs executed.
The RFC statistics are entered both on the client (caller) and on the
server (called) side. There are function module-related and de
stination-related RFC statistics.
If you activate the RFC statistics, the statistics file requires more
space. You can activate/deactivate the AD opcode statistics at runtime
using transaction ST03.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.