This would be a customization.

You can use an event handler for RowPersisting to check if there is at least one salesperson listed and throw an error if their is not.

[PXDefault(typeof(SOOrder.salesPersonID), PersistingCheck = PXPersistingCheck.Nothing)]

For the SOLine you can just modify the PXDefault Attribute to set the PXPersitingCheck to NullOrBlank which will make it a required field.

Hi @pandachan48   As suggested by @markusray17 It requires a small piece of customization.

Please find the code below.

// Sales Orders screen Customization 


public class SOOrderEntryExt : PXGraphExtension<SOOrderEntry>
    {
        #region SalesPersonID
         PXMergeAttributes(Method = MergeMethod.Append)]
         PXRemoveBaseAttribute(typeof(PXDefaultAttribute))]
         PXDefault(typeof(SOOrder.salesPersonID), PersistingCheck = PXPersistingCheck.NullOrBlank)]
        protected virtual void SOLine_SalesPersonID_CacheAttached(PXCache cache)
        {
        }
        #endregion 
    }

// Customers screen Customization

    public class CustomerMaintExt : PXGraphExtension<CustomerMaint>
    {
        public delegate void PersistDelegate();
         PXOverride]
        public void Persist(PersistDelegate del)
        {
            if (Base.SalesPersons.Select().FirstTableItems.ToList().Count == 0)
            {
                throw new PXException("Salesperson info not found");
            }
            del();
        }
    }

I tried using this and got the following error.  Should work for 2023r2?

e2024-02-03 20:44:58.989] \App_RuntimeCode\salesperson01.cs(6): error CS0246: The type or namespace name 'CustomerMaint' could not be found (are you missing a using directive or an assembly reference?)

e2024-02-03 20:44:58.989] \App_RuntimeCode\salesperson01.cs(6): error CS0246: The type or namespace name 'CustomerMaint' could not be found (are you missing a using directive or an assembly reference?)