Income — Negative Room Charge Validation

The system now catches negative room charge issues at three points — when saving a reservation, when posting daily charges, and during Night Turn pre-check — with clear error messages and direct links for fast resolution. Business Value

Catches negative room charge issues at the earliest point — when saving the reservation, before any charge is posted.
Prevents unbalanced Journal Vouchers from being created during daily charge posting.
Blocks the Night Run entirely if any in-house reservation would produce a negative room charge.
Shows clear error messages with clickable reservation links — no manual navigation needed.
Covers reservation save, all three daily charge posting locations, and the Night Turn pre-check screen.

Use Cases

Receptionist creates a reservation with a USD package on an EGP rate — the system blocks the save and shows exactly which night and rate is the problem.
Night auditor opens Night Turn, sees the pre-check screen listing affected reservations, clicks a link to fix the rate, then runs the night audit.
Front desk user posting daily charges gets an error with a clickable reservation link and jumps directly to fix the package setup.

Why Does a Negative Room Charge Happen? The net room charge is calculated as: (Rate Amount − Packages − Discount − Fixed Included Tax) ÷ (1 + % Included Tax). Three configurations can push this below zero:

Included packages exceed the room rate — packages collectively cost more than the rate amount (e.g., Rate = EGP 500, packages = EGP 580 → charge = −EGP 80).
Currency mismatch on packages — a package priced in a stronger currency (e.g., USD) converts to an EGP amount that exceeds the room rate (e.g., $10 USD → EGP 500 on a EGP 400 rate → charge = −EGP 100).
Fixed included taxes — a nightly fixed tax deducted from the room charge pushes the net amount below zero (e.g., rate − packages = EGP 10, fixed tax = EGP 20 → charge = −EGP 9.26).

To fix: review the rate’s included package setup and/or included tax configuration. Adjust package amounts or remove the currency mismatch so the net room charge is positive.

How It Works 1. Reservation Save — Blocked When Rate Setup Would Produce Negative Charges

Where: Front Office → Individual Reservation → Create / Edit

When creating or editing a reservation, the system now simulates the net room charge calculation for every night of the stay. If any night would result in a negative room charge, the save is blocked immediately.

Error message example: “Cannot save reservation: Rate [HALF-BOARD (ID: 42)], Night [2026-02-15] will produce a negative room charge because the included packages and/or tax setup exceed the room rate amount. Please check the included package setup and/or tax setup for this rate.” The error identifies the rate name, rate ID, and the specific night date with the issue.

Fix it before saving: adjust the rate’s included packages or tax configuration so the net room charge is positive for every night of the stay.

2. Night Turn Pre-Check — Negative Room Charge Block

Where: Income → Night Turn

Before the Night Run starts, the system checks ALL in-house reservations for the upcoming night. If any reservation would result in a negative room charge, a new section appears on the Night Turn pre-check screen:

Reservations That Would Result in a Negative Room Charge The following reservations would result in a negative room charge. Please check the included package setup and/or tax setup for this rate.

The section displays a table with all affected reservations:

Reservation	Guest Name
21028 (link)	John Smith

Reservation — a clickable link that opens the reservation directly.
Guest Name — the full name of the guest on that reservation.

The Night Run is fully blocked until all listed reservations are resolved. This works the same way as other Night Turn blockers — unsettled POS invoices and unclosed cashiers.

3. Post Daily Charges — Clickable Reservation Link in Error Message

Where: Front Office → Night Turn → Post Daily Charges

Also applies in:

Single Reservation Billing → Post Daily Charges
Front Office → Reservation List → Bulk Post Daily Charges

When posting is blocked because a reservation would result in a negative room charge, the error message now shows the reservation as a clickable link:

Error message example: “Cannot post daily charges: Reservation [1234], Rate [HALF-BOARD (ID: 42)], Night [2026-02-15] would result in a negative room charge. Please check the included package setup and/or tax setup for this rate.” Clicking [1234] opens that reservation directly. Fix the rate, package, or tax setup, then re-run the posting.