The 820 can be used in two different ways. A remittance 820 document can be
created and sent to the TP indicating what was paid. A Payment 820 document can
be created and sent to the bank. The bank will then send back an 824 indicated
that it received the payment and what time it was received.
The ISA-04 is in most cases overlooked. I use to receive invoices from a
company that would put our customer name/ID in the ISA-02. I did not validate
against it tough. I understand that the 820 is one of the more coveted
documents and security is a big issue. The last company I worked for utilized
them, sending out millions of dollars - but the finance people did not care if I
stuck in some information in the ISA-04 or not, as long it got there on a timely
fashion.
I suppose that you would ask yourself the question of - if I can create a way of
validating the data in the ISA-04, what will that serve?
This is just my thoughts on the matter, I'm sure that the security people in EDI
feel differently - but if you wanted secure - you should encrypt the whole
document then.
Kristian Bryant
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