Any particular reason to not having the relationship between table ? if not -
If both table have same value for BUHEAD
- then first thing you need to do is - rename your column with same name 'BUHEAD' (so that qlikview can do the association b/w the tables)
If you dont want to have the link b/w table still want to use the value .. you can use get GetFieldSelections(BUHEAD) as your both tables having the same value for this column and use this value for your requirement.