Add custom field as column to Process Shipments screen via custom DataView

The way I’d do it is to create a DAC extension for SOShipment with an unbound field for Requires Invoices, then populate that field in a SOInvoiceShipment graph extension when the records are fetched.
Here is the code for the DAC

using PX.Data;
using PX.Objects.SO;
using PX.Data.BQL;

// Acuminator disable once PX1016 ExtensionDoesNotDeclareIsActiveMethod extension should be constantly active
public class SOShipmentExt : PXCacheExtension<SOShipment>
{
    [PXBool]
    [PXUIField(DisplayName = "Requires Invoices")]
    public bool? UsrRequiresInvoices { get; set; }
    public abstract class usrRequiresInvoices : BqlBool.Field<usrRequiresInvoices> { }
}

Here is the code for the Graph

using PX.Data;
using PX.Objects.SO;
using PX.Objects.CR;
using Mapadoc;
using System.Collections;

// Acuminator disable once PX1016 ExtensionDoesNotDeclareIsActiveMethod extension should be constantly active
public class SOInvoiceShipment_Extension : PXGraphExtension<SOInvoiceShipment>
{
    public static bool IsActive() => true;

    public IEnumerable orders()
    {
        foreach (var record 
            in Base.orders())
        {
            SOShipment shipment = PXResult.Unwrap<SOShipment>(record);
            BAccount bAccount = BAccount.PK.Find(Base, shipment.CustomerID);

            SOShipmentExt shipmentExt = Base.Caches[typeof(SOShipment)].GetExtension<SOShipmentExt>(shipment);
            BAccountExt bAccountExt = bAccount.GetExtension<BAccountExt>();

            shipmentExt.UsrRequiresInvoices = bAccountExt.UsrRequiresInvoices;
            yield return shipment;
        }
    }
}

Since the field is apart of a DAC extension for SOShipment you should be able to add it to the Process Shipment screen via the customization editor in the same way you can add normal fields.
And here is a link to a previous question which I based my answer off of

If you run into any issues or have any questions let me know!
Philip Engesser