If your objective is to ensure that existing printers are identified correctly and only the data which you trust from JamF are updated by JamF SG integration, then you must do the following 2 things:
1. Review the identification rules for 'Printer' class. Go to CI class manager, open the Printer class and click on the 'Identification rules' tab to do this. Then check whether you need to update the identifier entries by considering the set of unique attributes for Printers from both discovery and JamF integration. The following URL has details about identification rules:
https://docs.servicenow.com/bundle/vancouver-servicenow-platform/page/product/configuration-manageme...
2. Configure the reconciliation rules for 'Printer' class. Go to CI class manager, open the Printer class and click on the 'Reconciliation rules' tab to do this. For example, you can either set discovery as a higher priority source than JamF for 'IP address' attribute to prevent overwriting or keep only discovery as the source for IP address (this totally preventing JamF from updating the IP address). The following URL has details about reconciliation rules:
https://docs.servicenow.com/bundle/vancouver-servicenow-platform/page/product/configuration-manageme...
