When you revise your Item list in Sales/Product List or Item Tracking/Configure/Items and Save changes, you will be prompted to update your recurring entries with the changes. If you select yes, your recurring invoices will automatically be updated with changes to Price, Taxable, Discountable, Track item and Track Serial numbers status you have made. Any recurring Sales Invoices batches which are OPEN will NOT be updated.
Changes to the Sales UOM of an item in the product list will not be reflected in updated recurring invoices. Changing the Sales UOM and updating the recurring invoices may not produce the desired results. It is recommended that you add new Sales UOMs rather than rename existing ones if you use the automatic update option.