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

Purchase Orders

Learn about Purchase Orders in Marlin GTX trusted automotive software by Megabus.

Updated 30 October 2026

**Marlin GTX** enables supplier purchase to be recorded and managed using the Purchase Orders modules.

The Purchase Orders module can be accessed by selecting Main > Data Entry > Purchase Orders from the menu bar.

Screenshot from the Purchase Orders BT help article
Warning — Make sure to select Purchase Orders, not Purchases. Purchases is a separate module used to record and invoice received purchase orders.

Purchase orders can also be added directly from within work orders.

Electronic orders can also be set up to be delivered directly to most major suppliers, using Megalink integration.

Tip — Megabus has electronic delivery arrangements with many major suppliers, including Burson, Repco, Bridgestone, Continental, Michelin, Pirelli, Yokahama and more. To enable electronic deliveries in your system, contact the Megabus Support Team.

Adding Purchase Orders

Main > Data Entry > Purchase Orders

The Purchase Orders module will open on the New Purchase Order screen.

Screenshot from the Purchase Orders BT help article

In the section at the top:

  • Select the Supplier
  • Enter the Payment Terms (if required)
  • If the supplier has multiple branches:
    • Select the Location
  • Tick the Prices Include GST checkbox, if applicable
Note — Whether a supplier's prices include GST or not by default is controlled by the Buy Including GST checkbox at the top-right of their Supplier Maintenance file's Details tab.
Screenshot from the Purchase Orders help article

If required, the order dates can be edited using the section on the right:

  • Order Date: The date the order was placed
  • Arrival Date: The expected receival date (for informational or planning purposes only)

Products and other details can then be added using the Line Details list below.

Order Number Allocations

The next sequential Order Number will be automatically allocated when a purchase order is saved.

If enabled, you can also click on the Allocate button at the top right of the Enter Purchase Order screen to allocate the order number before saving.

Screenshot from the Purchase Orders help article
Note — Some systems may be set up to manually enter purchase order numbers. If so, the Allocate button will not appear. To enable automatic order number allocations, contact the Megabus Support Team.

Purchase Order Products

Products can be added to the Line Details list as usual, by clicking on the magnifying glass picker on the next empty line.

Screenshot from the Purchase Orders BT help article

Once a product has been added to the details list:

  • Enter the Quantity to order
  • Enter the Expected Cost

Additional product lines can be added by clicking on the **Add** button at the top of the details list or pressing Shift+F9 on the keyboard.

Product Search

Products can also be added using the inbuilt Product Search function, which can be accessed by:

  • Clicking on the **Product Search** button at the top of the details list
  • Or pressing F5 on the keyboard
Screenshot from the Purchase Orders help article

The Product Search pop-up will open and can be used to find and add products to the order, as usual.

Screenshot from the Purchase Orders help article

Automatic Product Selection

Products can also be automatically added to purchase orders, based on supplier and product criteria, including:

  • Reorder levels
  • Monthly usage
  • Last order date

To automatically add products, click on the **Automatic Product Selection** button at the top of the details list.

Screenshot from the Purchase Orders help article

The Automatic Product Selection pop-up window will open.

Screenshot from the Purchase Orders help article

Select the required criteria:

  • Include Allocated Work Orders: Count products on allocated work orders as in-stock
  • Exclude Open Purchase Orders: Exclude products already on other purchase orders
  • Exclude Open Shipments: Exclude products already on other shipments

To add the products to the order, click on the Import button at the bottom-left.

Purchase Order Remarks

Remark lines can also be added by clicking on the drop-down arrow to the right of the **Add** button at the top of the details list or pressing F2 on the keyboard.

Screenshot from the Purchase Orders help article

Saving and Delivering Purchase Orders

When a purchase order is ready to send or place, click on the Save button at the top of the module window.

Screenshot from the Purchase Orders BT help article

The Document Delivery pop-up will open:

  • Select whether to Print or Send the delivery document as required
  • Click Deliver Note: Printed orders will still need to be placed manually, outside of GTX

Finalising Purchase Orders

If enabled, purchases can also be Finalised instead of saved, to allow electronic delivery to suppliers.

To finalise a purchase order, click on the Finalise button at the top of the module window.

Screenshot from the Purchase Orders BT help article

If electronic deliveries are enabled, select the Megalink option to send the order to the supplier.

Screenshot from the Purchase Orders help article

The time and date the order was sent will be shown in the Submitted column of the Manage Existing Orders list.

Screenshot from the Purchase Orders help article

After an order is submitted electronically, you will still be able to view and edit the order as usual, but the Finalise button will be greyed out so that you cannot submit it again.

COGVAR Limits

When finalising any purchase with a cost of goods sold variance above $0.05, a pop-up will open, warning you of the variance and preventing the order from being submitted.

Screenshot from the Purchase Orders help article

If enabled, an acceptable cost of goods sold variance limit can be defined, preventing the pop-up from opening if the variance falls under this threshold.

To enable or edit COGVAR thresholds, contact the Megabus Support Team.

Existing Purchase Orders

Existing Purchase Orders can be viewed and edited by clicking on the Manage Existing Orders button on the left of the Purchase Orders module.

Screenshot from the Purchase Orders help article

Saved orders will be removed from the list after they are Invoiced or Cancelled.

Editing Saved Orders

Saved orders can still be edited by double-clicking on them in the Manage Existing Orders list to open the Revise Purchase Order window.

Screenshot from the Purchase Orders help article

The order can then be edited and saved again, as usual.

Note — Clicking the Void button at the top of an open order will only void the changes made during the current editing session, not fully cancel the order.
Screenshot from the Purchase Orders help article

Cancelling Purchase Orders

Existing Purchase Orders can be cancelled by selecting them in the Manage Existing Orders list and clicking on the Cancel button at the top of the module window.

Screenshot from the Purchase Orders help article
Warning — Cancelling a purchase order in GTX does not communicate the cancellation with the supplier, even for suppliers whose orders are electronically delivered. You will still need to contact the supplier externally to cancel the order with them.

Work Order Purchases

Purchase orders can also be added directly from work orders when there is insufficient stock to fill the order.

Help centre screenshot

To add a purchase order:

  • Click on the **Import External Data** drop-down at the top of the details list
  • Select Purchase Order
    • If prompted, Save the details
Note — If there is insufficient stock, then the product Quantity number will be shown in red on the work order.

The Auto-Generate Purchase Order pop-up will open, showing a list of the out-of-stock products on the order.

Screenshot from the Purchase Orders BT help article

For each product:

  • Leave the Order checkbox on the left ticked to include it on the order
    • Or, untick to exclude the product from the order
  • If set, the default supplier for each product will be automatically selected (set using the Normal Supplier field in the Options tab of the product maintenance file)
    • Click in the Supplier cell to select a different supplier, if necessary

Tick the checkbox at the bottom to include the Work Order Details on the Purchase Order, if required.

To create the order, click on the Order button at the bottom-right of the pop-up.

The order will be automatically generated and delivered according to the supplier's document delivery settings.

Screenshot from the Purchase Orders help article

Orders added this way will still appear in the Existing Purchase Orders list:

  • The work order details are shown as a remark in the Purchase Order Details section below
  • The work order and booking details (if applicable) are shown in the columns on the right
Screenshot from the Purchase Orders BT help article