Problem finalizing bill: backend requires rounding item configuration

Hi, I’m implementing the “Finalize bill” button for this ticket.

The frontend part is working and the request is successfully sent to: POST /ws/rest/v1/billing/bill/{billUuid}

However, when setting the bill status to “POSTED”, the backend responds with:

“No rounding item specified in options. This must be set in order to use rounding for bill totals.”

This comes from RoundingUtil.handleRoundingLineItem → BillResource.setBillStatus.

It looks like the billing module expects a rounding item to be configured in the system before bill status can be changed. Do I need to configure a rounding item manually on my local environment? If yes, could you guide me where this configuration lives?

Just want to confirm the expected setup so I can continue working on the finalize action. Thanks!