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Marlin GTX help

Point-of-sale and business management for tyre and mechanical workshops.

Reversing Transactions

Learn about Reversing Transactions in Marlin GTX trusted automotive workshop software by Megabus.

Updated 30 October 2026

**Marlin GTX** enables reversing transactions to correct errors or undo completed processing.

This guide outlines how to perform each type of reversal, including:

Each process will open the relevant module, locate the original transaction and create a reversal entry to offset the original values.

Reversing Customer Invoices

Customer invoices can be reversed by performing an opposite credit note.

Help centre screenshot

To reverse a customer invoice:

  • Open the Invoices module:
    • Main > Data Entry > Invoices
  • Click Credit Note on the left
  • Select the Customer
  • Click on the Invoice Reference picker (far-right)
Help centre screenshot

In the Select Invoice pop-up:

  • Select the original invoice at the top
  • Check the Transaction Details below
    • Ensure all checkboxes for the required items are ticked
  • Click Select

The invoice details will be added to the reverse window:

  • Confirm the details
  • Click Finalise at the top of the module
Tip — To insert the full credit note amount in a payment type field, click the field and press Enter.

Reversing Customer Receipts

Help centre screenshot

To reverse a customer receipt:

  • Open the Receipts module:
    • Main > Data Entry > Receipts
  • Click Reverse Receipt on the left
  • Select the Customer
  • Click Search by Receipt below
Help centre screenshotHelp centre screenshot

In the Select Receipt pop-up:

  • Select the receipt in the top section
    • Review Allocations and Payment Methods below
    • Click Show All (bottom right) to show closed transactions
  • Click Select

The receipt details will be added to the reverse window:

  • Confirm the details
  • Click Finalise (top of module)

Reversing Supplier Payments

Help centre screenshot

To reverse a supplier payment:

  • Open the Payments module:
    • Main > Data Entry > Payments
  • Click Reverse Payment on the left
  • Select the Supplier
  • Click Search by Payment below
Help centre screenshotHelp centre screenshot

In the Select Payment pop-up:

  • Select the payment in the top section
    • Review Allocations and Payment Methods below
    • Click Show All in the bottom right to show closed transactions
  • Click Select

The payment details will be added to the reverse window:

  • Confirm the details
    • Tick Reverse Allocations Only (top-right), if required
  • Click Finalise at the top of the module

Reversing Delivery Dockets

Delivery dockets can be removed from your system by invoicing them and then reversing them, using a credit note.

Help centre screenshot

To reverse a delivery docket:

  • First, invoice the docket, as usual:
    • Select supplier
    • Select or import delivery docket
    • Enter details, reference number, amount and tax (if required)
    • Finalise the invoice
Help centre screenshot
  • Then, reverse the invoice using a credit note:
    • Click Credit Note on the left
    • Select the supplier
    • Use the Original Reference picker to select the invoice
    • Double-check the details
    • Finalise the credit note

Reversing Journal Entries

To reverse a journal entry, you will need to know the journal reference number.

Help centre screenshot

To locate the journal you want to reverse:

  • Open Account Maintenance:
    • Main > Accounts > Manage Chart of Accounts
  • Open the relevant account
  • Click on the Transactions tab at the top
  • Locate the relevant transaction and note the Our Ref number
    • You can ignore all leading zeroes (e.g. for "0000031" you just need "31")
Help centre screenshot

To reverse a journal entry:

  • Open the Journals module:
    • Main > Data Entry > Journals
  • Click Reverse Journal on the left
  • Select the Salesperson
  • Enter the Reference Number below
    • See above about how to locate
  • Click Load below
Help centre screenshot

The journal details will be added to the reverse window:

  • Confirm the details
  • Click Finalise at the top of the module
Note — End of Day postings cannot be reversed. If you need to reverse an End of Day posting, contact the Megabus Support Team.

Reversing Bank Reconciliations

Help centre screenshot

To reverse a bank reconciliation:

  • Open the Cashbook module:
    • Main > Data Entry > Cashbook or Bank Reconciliation
  • Click Reconciliation on the left
    • If there is an open reconciliation: Void it (red X at top)
  • Click on the Cancel a Previous Reconciliation button (blue arrow) at the top-right
Help centre screenshot

In the Previous Reconciliations pop-up:

  • Select the Cash Account
  • Select the reconciliation
  • Click Cancel Reconciliation
  • Confirm the cancellation:
    • Click Yes in the pop-up that opens
Help centre screenshot
Note — Only the previous reconciliation can be cancelled.