snc/r3int_rfc_qop is a SAP Parameter attribute which is used to control Quality of protection for internal RFCs with SNC 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 controls the protection level (quality of protection,
QOP), with which data is transferred by internal RFC if SNC is set for
internal RFCs (parameter snc/r3int_rfc_secure = 1 ) .
See SAP Parameter Documentation for full SAP documentation for this profile parameter.