Account for Overdue sales receipts on the Short Term Cashflow Projection

Currently, the short term cash flow projection does not account for overdue sales receipts. Bearing in mind that very few customers actually pay on time, it makes this functionality virtually useless. All that needs to be done, is that the list should include overdue receipts and payments in the projected balance for today. The user can choose to change the due date or to untick the include option if required.