[GNC] Strange incorrect due date calculated on a duplicated bill

[Adrien Monteleone]

I'm catching up on some paperwork and entering old vendor bills. I've 
never seen this issue before, and can't seem to figure out why this one 
bill is not correctly calculating the due date.

Screen shot is attached. (hopefully it goes through)

Terms are set at Net20. Every other bill for this vendor correctly 
calculates the due date as the 27th of the month, for their bills posted 
on the 7th.

I don't think using the Duplicate feature is even at play because I just 
did that about 10 times prior with no issues.

Any ideas? Bug?
-- 
Regards,
Adrien
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