Tapping a service product in the Services screen lists all sales of the product.
To enter a new sale, tap Add a new sale. To edit or carry out an action for an existing sale, simply tap the sale.
A greyed-out transaction indicates one or more of the following:
The transaction appears on a statement. For these, you are not able to change information such as the transaction type or amount. If you need to correct an amount you previously entered, you can edit the transaction from the Statement screen.
Opening a transaction gives the reason why it is greyed out at the bottom of the transaction form.
For further information, please refer to: