Specifications General Ledger

multiple currencies

• There is a base currency for each ledger, the balances of the ledger are stored in the base currency
• There is an international currency
  • it is only used for reporting (previously it was stored with each balance, but that caused too much problems/overhead)
• There can be foreign currency accounts which have balances in their own currency
  • they can be revaluated with a new daily exchange rate
• exchange rate is stored in the database
  • corporate exchange rate (eg. issued once per month, an average exchange rate over the last 30 days)
    • the corporate exchange rate is used for calculating the reports in international currency
    • it is also used by ICH for clearing the debits/credits of the different offices between each other
  • daily exchange rate: this can be updated each day, or downloaded from Yahoo Finance etc.
    • the daily exchange rate is used for transactions with other currencies (different from base currency)

transactions

double entry bookkeeping

• see also http://en.wikipedia.org/wiki/Double-entry_bookkeeping_system

Transactions in GnuCash

• see [1]
  • "For every transaction, total debits must equal total credits."
• see GnuCash Manual: Multiple Split Transactions; also see a discussion here: [2];
  • there are simple transactions (one split), which just post to 2 accounts, with same (opposite) amount, same narrative etc
  • there are multiple split transactions, that have several transactions, and combined they balance
  • see the GUI of GnuCash for this:

You can switch between View: Basic Ledger, this shows only the summary:

The other View is: Transaction Journal, this shows all movements of money involved:

Transactions in Petra 2.x

• the definition of transaction in Petra 2.x is different from anyone else's definition: In Petra 2.x, a transaction only involves one account, therefore you need at least 2 transactions to get to "total debits equal total credits".
• in Petra 2.x: a lot of transactions are in one journal, only some of them really belong together ("total debits equal total credits").
• a journal was only used for different grouping transactions by currency
• it was hard to find all parts of a real transaction, because there were so many transactions in the journal unrelated to each other

Transactions in OpenPetra

• option 1: do the same as GnuCash:
  • keep the same database structure as in Petra 2.x, with a_batch/a_journal/a_transactions
  • different GUI: journals are not displayed anymore as such, but they become the transactions to the user; you can expand a journal line and see/edit the transactions involved.
  • simple transaction involves 2 accounts
    • only one reference/narrative/amount
  • split transaction: allows to define each account/reference/narrative

• option 2: keep the Petra 2.x users happy
  • addition in the database: a_transaction.a_transaction_group_i: refers to one transaction in the group; all transactions with the same a_transaction_group_i make up a real bookkeeping transaction
  • GUI: mark several transactions in the grid, and click button "Group", which will assign the first transaction_number_i to all transaction_group_i in the group.

• improved reports will show the opposite transaction(s), on Account Detail report etc.

Posting

• posting: should show a preview of how the account balances would be after posting???

reduce number of tables

• to test: should there be 3 different tables, for transactions from the current periods, the closed periods of the current year, and periods of previous years?
  • is Postgresql fast enough to cope with all transactions in one table?
  • this would make reporting much easier