A Transaction is comprised of two 'halves'
- the Payment - describing how much was paid, by what method, why it was given
- the Allocation(s) - describing what that money was paying for, how it is being allocated in terms of how it will be accounted for
It is possible to have multiple allocations against one payment - e.g. a split gift.
Recurring Payment Instructions follow the same structure.
For more info on the meaning of the various elements of a Transaction look at this article.