General Tab
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Source Account Code From/To
The account code, or range of account codes, to be used to calculate the source amount for an allocation. Transactions posted to this range of accounts are selected and used as the source of an allocation.
When a split type allocation is specified in Allocation Setup (CALS), the source transactions are reversed out of this account during an Corporate Allocation Run (AR). These are called the source reversal postings.
Source Offset Account
This account is only required for split type allocations, and only if the target transactions are to be posted to a different business unit. Source reversal balancing postings are made to this account to keep the source business unit in balance. See What Ledger Transactions are Generated by Corporate Allocations?
Source Actual/Budget
The ledger from which the source transactions are selected. For example, you may want to use the transactions in the actuals ledger as the basis for generating budget updates, in which case you would select the actuals ledger here as the source. A ledger is identified by a letter between A and K.
Source Amount
The source amount determines the accounting periods for which transactions are selected from the source accounts. The following options are available:

Balance - the transactions selected include all postings up to and including the periods specified during Allocation Run. Year to Date - the transactions selected include all postings made during the current year, up to and including the periods specified during the allocation run. Period - the source transactions include transactions for the period, or period range, selected during the allocation run. Change in Balance - the source transactions include transactions entered since the previous allocation run, up to the periods selected during the allocation run. Average Balance - the average balance is calculated by finding the balance of each day in a period, totalling these balances and dividing by the number of days in the period selected during the allocation run. The days in the period included in the average balance calculation can be controlled using the allocation calendar.

Retain Source Period
If this option is selected, the source reversal and source reversal balancing transactions are posted to the accounting period on the original transactions, rather than the period defined in the allocation run. This option only applies if a source offset account is specified. Otherwise, the source reversal is always posted to the same accounting period as the target transactions to keep the journal in balance.
Allocation Targets
Click this to define or review allocation targets as defined using Allocation Targets (CALT).
Allocation Setup
Click this to define or review allocation definitions as defined using Allocation Setup (CALS).
Allocation Ratios
Click this to define or review allocation ratios, as defined using Allocation Ratios (CALR).