Since you are joining tables, you might need to use the 
"tablename.fieldname" format to refer to the field in question. Does 
'%(product.productName)s' work (assuming "productName" is in the db.product 
table)?

Anthony

On Friday, April 12, 2013 11:59:59 AM UTC-4, Jim S wrote:
>
>     requires = 
> IS_IN_DB(db((~db.productSite.productSiteId.belongs(currentItems)) &
>                            (db.productSite.availableAddon==True) & 
>                            (db.productSite.siteId==workorder.siteId) &
>                           
>  (db.product.productId==db.productSite.productId)), 
>                         db.productSite.productSiteId,
>                         '%(productName)s', zero='..')
>
> I get a trace back with this.  If I pull out the '%(productName)s' it 
> works.   But, I want to specify the field name to display being a field in 
> the table linked by the 4 'anded' query.
>
> Help?
>
> -Jim
>

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