Questions:
1) Does an agreement, if paid in full, have to have a single invoice?
2) Likewise, for multiple partial payments for an agreement, there'll N invoices?
3) Does an invoice have to refer to the agreement somehow? And if so, how? By some unique number if I'll have to come up with?
4) And invoices can be issued retroactively, if needed, right? Because how would a bank or tax man verify when precisely an invoice was issued: today (retroactively) or 1 month ago?
1) Does an agreement, if paid in full, have to have a single invoice?
2) Likewise, for multiple partial payments for an agreement, there'll N invoices?
3) Does an invoice have to refer to the agreement somehow? And if so, how? By some unique number if I'll have to come up with?
4) And invoices can be issued retroactively, if needed, right? Because how would a bank or tax man verify when precisely an invoice was issued: today (retroactively) or 1 month ago?