Create zero invoice.
A zero invoice is a reset of the project up to a specific date.
To close a period, you normally need to finish invoicing a project. If no balance needs to be invoiced or credited, you can use 'Create zero invoice'. This is a way to close the period without sending the customer an invoice. Uniconta creates invoice items in the invoice file with an invoice number so that the documentation for the zero invoice is in place.
Zero invoicing requires an item to be created as 'Service' in the warehouse. In the 'number series' project, an item number must be set up to be used for the difference between the amount invoiced on account and the amount that should have been invoiced.
NOTE: To see the menu item 'Create zero invoice' under project, it must be enabled under preferences, see here
NOTE: It is recommended to set the number of [Decimals] to a minimum of 4 (preferably 6), otherwise rounding errors may occur.
NOTE: It is recommended to create a special product group for zero invoice where no accounts are set up. This means that all account fields must be empty.

Part number must be added in:
Project / maintenance / number series / section settings.

Read more about project number series
here.
To create a "Zero invoice", select the menu item in the "Project" or "Work in progress" overview. Read more
here and
here.
Selecting the menu item "Create zero invoice" will display the screen below:

Select the invoice date. The period to invoice and the type to create a zero invoice for
Type: A Zero invoice has no revenue line. So no "Revenue type" is actually required. Uniconta automatically sets up the first invoice type (Revenue) that is set up. Read more under project types
here.
It is possible to zero-bill only the items related to a task. There are two options. If one task is selected in the Task dropdown box, all items on that task are selected for invoicing. If no task is selected in the Task dropdown box, all items are selected for invoicing. Items can always be selected or deselected under Basis of posting. Read further down in this document.
You can choose to invoice everything in a workspace. There are two options. If you select a Workspace in the dropdown box, all items in that Workspace are selected for invoicing. If no Workspace is selected in the dropdown box, all items are selected for invoicing. Items can always be selected or deselected under Basis of posting. Read further down in this document.
A "Zero invoice" can be created without it appearing on the screen. This closes all items selected from the above selection and posting is done in finance based on the setup.
Alternatively, the "Zero invoice" can be displayed on the screen by checking "Create invoice proposal".
If this option is selected, you need to control whether the customer should receive the invoice or not.
A Zero Invoice is now created with relation to the project items. The amount on a Zero Invoice should be 0.

Deleting the lines results in this error.

If you want to delete the lines, it can be done as follows. An offer may have been created here, which can then be retrieved. Read more
here.

Zero, the Zero invoice can be created. As seen below, the invoice amount will be 0 and no invoice will be created and displayed on the customer's bank statement

When processing the zero invoice, it is possible to use the same adjustment and carry-forward functionalities as in the Invoice proposal.
Deselect or retrieve new items in invoicing (Itemization basis)
Items can be deselected and/or new ones can be retrieved in invoicing.
Tap 'Posting basis' to deselect and/or retrieve project entries.

Tap [Add Project Entries] to retrieve any project entries posted since the invoice was created.
If there are items that should not be invoiced, uncheck the items that should not be invoiced.

Tap 'Restore order' to transfer records to the Order.
Regulation and routing
ATTENTION: If a Control type is not set as default, an error message will appear stating that 'Type' is missing. If this happens, the screen below must be filled in. If a default species is set, the user does not need to fill in the screen. Read more under project types
here.

In this screen you can fill in how to regulate.
Should it be done on the Project with the adjustment, as shown above and/or should part of the adjustment be carried forward to the same or another Project - also as shown above.
You can also decide whether the adjustment should be posted with e.g. employee and/or dimension(s)