[Vtigercrm-developers] workflows issue (v6.0)

[SIAM Translations LLP]

Module invoice
Set workflow as follow:

Until the first time the condition is true
All conditions: Status is "Sent"
Task: Send email 1 day after due date.

The problem is that even invoice status is changed to "Paid" workflow 
sending email to Customer anyway.
A bit embarrassing doesn't it?  Is here anything wrong?
Appreciate help

-- 
Andrew Smith