Commerce5 supports the mapping of custom order attributes that are created using the Amasty Order Attributes Extension:
https://amasty.com/order-attributes.html
Example creation of Order Attributes
Example Purchase Order # that has been entered on an order
In order for these custom order attributes to be imported to Counterpoint the following "custom" array must be included as part of the salesOrderInfo SOAP v2 WSI module
Note: It is the responsibility of the Magento Developer to add this custom array if it is missing
<custom> <complexObjectArray> <key>note</key> <value></value> </complexObjectArray> <complexObjectArray> <key>desired_ship_date</key> <value>0000-00-00</value> </complexObjectArray> <complexObjectArray> <key>cust_po_no</key> <value>06202017</value> </complexObjectArray> </custom>