post https://eu-ext.linnworks.net/api/PurchaseOrder/Modify_AdditionalCost
Modify purchase order additional costs. You can add new lines, update and delete existing. The method will return modified list back to you with each record identified by unique identifier.
Purchase Order header will also be returned with new total recalculated
Permissions Required: GlobalPermissions.Inventory.PurchaseOrder.EditPurchaseOrderNode
Rate limit: 150 / minute