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Natural account segment
In Oracle General Ledger, the segment that determines whether an account is an asset, liability, owners’ equity, revenue, or expense account. When you define your chart of accounts, you must define one segment as the natural account segment. Each value for this segment is assigned one of the five account types.

Natural Application Only
A Transaction Type parameter that, if enabled, does not let you apply a transaction to a debit item if the application will reverse the sign of the debit item (for example, from a positive to a negative balance). Natural Application does not apply to chargebacks and adjustments.