Invoicing from Activity Slips - Create a nil invoice

Hi Sam_P 

The Prepare Timebilling invoice window is designed to hide customers that have a 0.00 balance for their activity slips/work in progress. As such, if you have a positive activity slip and a negative activity slip that cancels each other out the customer doesn't appear as their work in progress is 0.00.

However, the way I would deal with your situation would be below:

1. Create one of the activity slips
2. Navigate to Time Billing>>Prepare Time Billing Invoice
3. Tick that activity slip and process the Time Billing Invoice
4. Record that Time Billing Invoice
5. Create the second activity slip
6. Navigate to Sales>>Sales Register>>Open Invoices
7. Choose that created invoice
8. Within the Enter Sales window, select WIP (bottom of the screen)
9. Tick the relevant activity slip to add to the invoice before selecting Prepare Invoice

The above process will create an invoice using the first activity slip before adding the second activity slip on to that invoice. If those activity slips cancel each other out the invoice will have a 0.00 value thus closing the invoices and activity slips.