Set checkbox state by inventory update

@hotdok  I see that you created Unbound field (NOT a database field), so it will not save into the database. Once you refresh the screen, it will clears the value.

If you wanted to change to Database field. Below is the code for reference.

 protected virtual void SOLine_InventoryID_FieldUpdated(PXCache sender, PXFieldUpdatedEventArgs e, PXFieldUpdated BaseInvoke)
 {
     BaseInvoke?.Invoke(sender, e);
     SOLine row = (SOLine)e.Row; 

     if (row != null)
     {
         ClaLimitInv.SOLineExt itemExt = row.GetExtension<ClaLimitInv.SOLineExt>();
         itemExt.UsrIsRestrictedField = true; 
     }
 }

DAC:

public class SOLineExt : PXCacheExtension<PX.Objects.SO.SOLine>
  {
    #region IsRestrictedField
    [PXDBBool]
        [PXDefault(false, PersistingCheck = PXPersistingCheck.Nothing)] 
        public virtual bool? UsrIsRestrictedField { get; set; }
    public abstract class usrIsRestrictedField : PX.Data.BQL.BqlBool.Field<usrIsRestrictedField> { }
}