The user wanted to know why, when ordering a Catalog Item containing a Multi-row Variable Set, after clicking "Checkout", the system threw a modal/alert saying "Changes you made will be lost". The user wanted to know why, when ordering a Catalog Item containing a Multi-row Variable Set, after clicking "Checkout", the system threw a modal/alert saying "Changes you made will be lost". Note: Typically, the "Checkout" button will only be present as a part of the two-step checkout process, but this issue still occurs with two-step checkout disabled in the portal. After investigating this behavior, it was found that the user had created a custom UI Script "TabbedFormAppProcessesV2" that was causing the issue. When the UI Script was disabled, the issue ceased.