How to reconcile the actuals recorded against line item breakdowns on payment applications.How to t

On a payment application (commitments), if there exists a lumpsum line item(say A), which is broken down to two sub-line items(say A1,A2), and if we record actuals against all three line items in 'This Period Actuals', how do we reconcile the total amount paid.

The 'This period actuals' against line A , will not show in the costsheet, because, it is not costed(cost codes are against the breakdown line A1, A2).Is is available anywhere on the costsheet.

The actauls against the line items A1, A2 are shown only on the SOV sheet as Total completed to Date and not surfaced on the upper form.Is the breakdown (A1, A2)only to be managed on the SOV sheet, and no validation runs against the parent line item(i.e.,line item A here)