When migrating from Voyager to Alma it may be helpful to identify, review, and perhaps "fix" those MFHDs which have Items attached but which have a null call number.
This query, which can be run using Voyager's Prepackaged Access Reports, lists cases where the call number is null and there are items attached to the MFHD.
SELECT DISTINCT MFHD_MASTER.MFHD_ID, ITEM.ITEM_ID
FROM ITEM INNER JOIN (MFHD_MASTER
INNER JOIN MFHD_ITEM ON MFHD_MASTER.MFHD_ID = MFHD_ITEM.MFHD_ID)
ON ITEM.ITEM_ID = MFHD_ITEM.ITEM_ID
WHERE (((MFHD_MASTER.DISPLAY_CALL_NO) Is Null));
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.