How to create custom AR payment terms ID with *TWO* fixed payment dates per month
In a single Payment Term, based on the invoice date automatically calculate the Payment date as follows:
Invoice dated 15th to 30th September, payment due date is invoice date +60 = 15-30 November, payable on December 1st
Invoice dated 1st to 14th September, payment due date is invoice date +60 = 1-15 November, payable on November 15th