Symptoms

By default, OOB 'Windows OS - Servers' Pattern return Baseboard Serial number, but in some case, customer might wanted to use the Bios Serial number for the CI instead.

 

Cause

From the 'Windows OS -Server' pattern, step '5. Insert serial number to cmdb_ci_win_server':

Value=$cmdb_serial_number[1].serial_number [we will get the 1st row (baseboard) in the cmdb_serial_number table]

Resolution

There are 3 options:

1) Changed the order/swap these 2 steps (3.10 and 3.12) in the pattern 

2) For example: in the cmdb_ci_serial, Bios listed in 2nd row 

 

Modified steps 5 as below:

FROM: Value: $cmdb_serial_number[1].serial_number
TO: Value: $cmdb_serial_number[2].serial_number

 

3) Edit the 'OSs - Pre Sensor' Pattern Pre/Post Script index:

FROM: for(var serialIndex = 0; serialIndex < serialList.length; serialIndex++){
TO: for(var serialIndex = 1; serialIndex < serialList.length; serialIndex++){

https://<instancename>.service-now.com/$sn_pattern_designer.do?sys_id=670e55a4db702200c06776231f961942&authoring_mode=modify&editor_mode=advanced&section_item_type=identification&section_item_name=discovery

[Note: attached script here]

Additional Information

Serial Number Valid Field:

https://hi.service-now.com/kb_view.do?sys_kb_id=198e4f97db583b4813b5fb2439961924&sysparm_rank=7&sysparm_tsqueryId=b77a23a7db2dbf084819fb24399619ba