A computer processor subsystem, e.g. called a “target”, in response to receiving an update to vital product data of the system from a source computer processor subsystem, examines the update to detect the vital product data of the target computer processor subsystem stored by the source computer processor subsystem; and, in response to the detected vital product data being incorrect, the target computer processor subsystem forwards its correct vital product data to the source computer processor subsystem having the incorrect vital product data. A computer processor subsystem is the authoritative reference for its vital product data.