The open procurement interface allows you to create detail tags. The restrictions that have to be considered when splitting a tag also applies here. For example, you cannot create a detail tag if the selected order line item is not a tagged item.
To create a detail tag on the order line item level, you have to include the <POLI_SPLIT_TAG> tag in your xml-file. For the creation of a detail tag on the item shipment level, the <ISH_SPLIT_TAG> tag is needed. These tags have to be included below the LINES and SHIPMENTS elements/tags, respectively. The software will then create a detail tag for the order line item or item shipment determined by PO_NUMBER, …, POLI_POS, POLI_SUB_POS (and possibly ITEM_SHIP_POS and ITEM_SHIP_SUB_POS).
For more information, see Open Procurement Interface.