Acumatica Example

gistfile1.cs

        //Update price and repair item type when inventory ID of repair item 
        //is updated.
        protected void _(Events.FieldUpdated<RSSVRepairItem, 
            RSSVRepairItem.inventoryID> e)
        {
            RSSVRepairItem row = e.Row;

            if (row.InventoryID != null && row.RepairItemType == null)
            {
                //Use the PXSelector attribute to select the stock item.
                InventoryItem item = PXSelectorAttribute.
                    Select<RSSVRepairItem.inventoryID>(e.Cache, row) 
                    as InventoryItem;
                //Copy the repair item type from the stock item to the row.
                InventoryItemExt itemExt = item.GetExtension<InventoryItemExt>();
                e.Cache.SetValueExt<RSSVRepairItem.repairItemType>(
                    row, itemExt.UsrRepairItemType);
            }
            //Trigger the FieldDefaulting event handler for basePrice.
            e.Cache.SetDefaultExt<RSSVRepairItem.basePrice>(e.Row);
        }