If cost centers are being used, when performing the update Spectrum removes the vendor invoice history only if you have permission to access the cost center assigned to the invoice. Spectrum compares the invoice's cost center with cost centers in your assigned cost center scheme, and if the invoice cost center is not present, then that vendor history is not removed. Spectrum also compares the vendor's list of shared cost centers with cost centers in your assigned cost center scheme, and if there are no common cost centers, then that vendor history is not removed.