gistfile1.txt

A. auto payment + overdue

1. CPC -> ERP prepayment: tid: 1, amount: 500, status: open
2. daily sync
   <14d, tid: 1 erp: pending -> cpc: open
   >14d, tid: 1 erp: pending -> cpc: overdue

gistfile2.txt

1,500,paid (erp status: pending)
2,500,paid (erp status: pending)
3,500,paid (erp status: pending)
4,500,paid (erp status: pending)
-> payments: 2000, costs (e.g) 1500 -> balance: +500 channels stay open

ERP teilt mit das id1, overdue ist:

1,500,unpaid (erp status: unpaid)
2,500,paid (erp status: paid)
3,500,paid (erp status: paid)
4,500,paid (erp status: paid)
-> payments: 1500, costs (e.g) 1500 -> balance: 0 channels stay open

gistfile3.txt

CPC side:

  - problem: CPC payments in previous years cannot be changed
  - balance  = sum(payments)

Prerequisites:

- no partial payments, only complete payments (extra note on invoice?)
- paid -> open/overdue needs special care by accounting

ERP to CPC daily sync (e.g. amount: 500)

open -> paid            # change state of existing entry - does not change balance
open -> overdue         # new reverse entry, -500
open -> refunded        # new reverse entry, -500

paid -> open            # change state of existing entry - does not change balance
paid -> refunded        # new reverse entry, -500
paid -> overdue         # new reverse entry, -500

overdue -> paid         # new duplicate entry, +500
overdue -> refunded     # change state of existing entry - does not change balance

refunded -> open        # new duplicate entry, +500
refunded -> paid        # new duplicate entry, +500
refunded -> overdue     # change state of existing entry - does not change balance


States of prepayment:
  open: no payment
  paid: payment from everything except refund journal
  refunded: payment from refund journal
  overdue: open and older then x days


Optional immediate notification for:
  open -> paid
  paid -> open
  open -> refunded
  paid -> refunded
  overdue -> paid
  overdue -> refunded