Bc4j field validation that involves more tables and is defered at commit

For us is very common that business logic involves
more (aggregate) tables.
For example consider a invoice and
the lines of the invoice. These are two tables but
a business rule say that the sum of the line should
be the total column of the invoice. Moreover the
total of the invoice can't be zero. The need the
existence of the total column in invoice is required
because speed up queries and for the constraints and
we can't make it only a display value of a
query.
How can I make this with bc4j? Note that should
be a defered constraint because during elaboration
this constraint can't be temporary violated
(ie durign line adding).
Thanks.
Davide.

See this link for a pointer to a whitepaper on implementing business rules in BC4J for tips on this.
http://radio.weblogs.com/0118231/2003/09/04.html#a145

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Bc4j field validation that involves more tables and is defered at commit

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