You need to change your IS_EMPTY_OR from:
IS_EMPTY_OR(IS_NOT_IN_DB(db, 'product.code_1',error_message=T('Code 1
already in use'),ignore_common_filters=False))
To
IS_EMPTY_OR(IS_NOT_IN_DB(db, 'product.code_1',error_message=T('Code 1
already in use'),ignore_common_filters=False), null='')
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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