To provide visibility and remind users to add the procurement supplementary items for the purchasing item, users can enable the Supplementary item pop-up parameter in the Procurement and sourcing parameters form (Procurement and sourcing > Setup > Procurement and sourcing parameters). When the parameter is enabled, the system automatically pops up the Calculated supplementary items dialog when creating a new purchase order line, if the purchasing item has the procurement supplementary items defined.
Additionally, the Supplementary item setup field is available under the Setup tab in the Line details of the purchase order to provide visibility on whether the purchasing item has any defined procurement supplementary items. This helps if the user decides to cancel adding any supplementary item at first, acting as a reminder to add them later via the manual process (that is, by clicking the Purchase order line > Calculate > Supplementary items button).