>Hi,
>
>I may have asked this before, my apologies if I have, but I can't work out how to do this.
>
>I have a Receipt BO and a ReceiptDetails BO which is a child of the Receipt BO. For data entry validation, the user has to enter a total amount received at the Receipt BO level and then the sum of the amounts entered at the Receipt Detail BO level must equal the Receipt BO's total amount received.
>
>How should I approach writing such a Business Rule?
>
>I guess it should be at the Receipt BO level, but how would I refer to the child BO to sum all the amounts?
Frank,
In your Receipt BO Rules method, create a ReceiptDetail BO, call the method to sum the details and check that amount against the amount in the Receipt BO.