Network Router Pattern discovery does not populate serial_number field on router CI, but serial number is created in cmdb_serial_number.DescriptionNetwork Router Pattern discovery does not populate serial_number field on router CI, but the cmdb_serial_number records (in related list) are created. Cause In Network Router Pattern, Step "14. Set Switch name from DNS data if isSnmpTrusted is false" removes already discovered variables such as serial_number. Before this step, we already populated variables like serial_number, but after this step, serial_number becomes empty.The result is that IP Router CI cannot populate serial_number although cmdb_serial_number can be created.Steps to Reproduce 1. Discover a network switch on New York Patch 4 Hot Fix 1 instance2. IP Router CI will be created without serial_number value although the cmdb_serial_number record can be created3. In Network Router Pattern debug the variable serial_number is populated before step "14. Set Switch name from DNS data if isSnmpTrusted is false" 4. After this step the variable serial_number is set to empty.WorkaroundApply the update set attached to the KB/PRB1395505. sa_pattern_198b6af1db7d2200868a7c841f96192d (2).xmlRelated Problem: PRB1395505