Creating an Intercompany Sales Order via Transactions > Sales > Manage Intercompany Sales Orders throws error: Invalid price reference key -1

The Invalid price reference key error is usually caused by the missing Unit Price/Rate column on the sales order form. Make sure that the preferred sales order form includes the Unit Price/Rate column:

1. Navigate to Customization > Forms > Transaction Forms.
2. Click Customize/Edit next to the preferred sales order form.
3. Click on the Screen Fields tab > Columns subtab.
4. Make sure that the Show box is ticked for the Unit Price or Rate column.
5. Save.