Andrew, from what you are advising:
On the 1st-15th
I would set the Term Code to Numbers of days from a specific day of month, and set the Number of days: 0 and Day of Month: 31
On the 16th-31st
I would change the setting to: A specific day of next month and set the Day of month to 15.
I tried this and it seems to work.
Thus, I would have to go into the Terms Code twice a month to make these changes; after we complete the Invoicing on the 15th and again at month end.
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Samuel Kopstick
S Kopstick & Associates Inc
Toronto, ON