Question
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I am working with the outbound invoicing (810 in X12) document.  Last week,
I set the "Send document" switch in my Partner's transaction set
information section to "no".  So, why are triggers still getting generated?
Does the fact that I have a Customer Partner Relationship set up for this
customer have anything to do with the trigger getting created?

Answer
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To answer this, note two important details about timing and setting of the
switches:
 
1. Timing Point one:
Whether or not the invoice trigger is created is determined at the moment
the order is created (or received and created).  If you have a customer
partner relationship at order creation time (thus, we know the partner) and
your partner has the "Send Document" switch set to yes, then the Send-edi
switch on the order is set to yes and the order.partner is set to the
appropriate partner.
  
Timing Point two: Phase between Points one and three.  After the order is
created, you may change both these fields via the Order Entry function to
generate or not generate an invoice trigger.

Timing Point three:
When Invoicing occurs, the Send-EDI and Partner values are copied from the
order to the invoice.  When the invoice is created, you may change both
these fields via the Invoicing function (see the override header section).
Should the values of these two fields indicate "Send-EDI" = yes and
"Partner" = [somevalidpartner], then a trigger is created when you press
"P" to process the invoice.    

2. If you do not want triggers to be generated for invoices starting from
the point that you change the send document from within the partner
transaction set information section, the ideal timing point to do so would
be before timing point one for all orders for that customer/partner.  

Now here is where the answer to your question comes in.  When you change
the "Send-Document" switch in the Transaction Set Information section of
the partner "after" orders have been created (after point one), you ALSO
need to indicate to the system that you have changed your mind with respect
to invoice trigger creation for orders that have "already" been created; do
this by changing the EDI switches on the orders that are waiting to be
invoiced.  Change the order.send-edi and order.partner switches to no and
blank respectively if you are at timing point two.  Or, if you are at
timing point three, when you invoice, change the invoice.send-edi and
invoice.partner to no and blank respectively so that triggers are not
generated.  

When you are at point two or three, it is preferable to do this change for
ALL orders with that customer/partner combination for two reasons: the
order may generate multiple invoices and you'd have to check the send-edi
and partner on all invoices to avoid trigger creation.  Secondly, there may
be a long time lapse between order creation and invoicing.  

Should you have already created the invoices, then clean out all the
triggers for this partner and customer/transaction set combination so that
the EDI invoice is not generated from the trigger.