Due date for Travel Expense Management

Hi Team,

We have a requirement of posting accounting document for expense incurred by employee to vendor account. This we have achieved. Now we have to make payment to this vendor after 30 days. Mean payment terms is to be used for 30 days.

Now our question is in order to calculate 30 day payment terms, which date is considered by system. Posting date or document date? Is there any other date considered other than this 2 dates. I am totally new to TEM.

Regards

Zunaid