When migrating from Voyager to Alma, you will need to identify and resolve any duplicate vendor codes. In Alma, vendor codes must be unique.
This query, which you can run using Voyager Prepackaged Access Reports, will identify duplicate vendor codes.
SELECT VENDOR.VENDOR_CODE, Count(VENDOR.VENDOR_ID) AS CountOfVENDOR_ID
WHERE (((VENDOR.VENDOR_CODE) Is Not Null))
GROUP BY VENDOR.VENDOR_CODE
For other queries that may be useful, see my "Surviving Almanado: tips for a successful pre-implementation" presentation's Accompanying Materials.
If you need assistance in running custom SQL queries in Prepackaged Access Reports, consult the Voyager Customer Listserv.