It accepts the formula without any indication of error.
In SharePoint, total price is a single line text column. Upon creation of a new item, it is left blank (which is fine). After creating, the child items in 'PO Requisition Detail', I want to click this icon to update the total price in SharePoint.
Edit: Total Price in PowerApps is a custom card, is that causing me trouble? I have tried changing it's data field name so the custom card and default card (not shown on any forms) are distinct, but then it can't find it with ThisItem.ChangedName