stat/btcrec is a SAP Parameter attribute which is used to control Max. number of btc step 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 .
Maximum number of batch step records written during one run of
a batch job. Normally each step of a batch job is represented
by one batch step record.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.