Hi

Im mapping a database with sqlsoup and when use db.relate shows this error:

sqlalchemy.exc.ArgumentError: Could not determine join condition between 
parent/child tables on relationship MappedCatalog_unit.catalog_product. 
 Specify a 'primaryjoin' expression.  If 'secondary' is present, 
'secondaryjoin' is needed as well.


this a sample of how looks the relationship in data base

catalog_unit:
name = char()

catalog_product:
unit_purchase = ForeignKey(catalog_unit)
unit_sale = ForeignKey(catalog_unit)

anyone knows how fix it?



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