Capable to Promise for a configurable item

I’m not sure, why this question is asked in customizations section, but based on the fact, that we have customization branch of the community, here is my thought process:

Step 1, find the error message in Visual studio:

Step 2, find the constant ConfirmChangeSourceDeleteConfigResults usage in the same way, and below goes the code:

        protected virtual void AMProdItem_DetailSource_FieldVerifying(PXCache cache, PXFieldVerifyingEventArgs e)
        {
            var row = (AMProdItem)e.Row;
            if (row != null)
            {
                var newSource = (int?)e.NewValue;

                if (newSource == ProductionDetailSource.Configuration && row.Function != OrderTypeFunction.Disassemble)
                {
                    if (!ItemConfiguration.IsConfiguratorActive)
                    {
                        e.NewValue = ProductionDetailSource.NoSource;
                        e.Cancel = true;
                    }

                    if (row.IsConfigurable != true || row.Function == OrderTypeFunction.Disassemble)
                    {
                        cache.RaiseExceptionHandling<AMProdItem.detailSource>(row, e.NewValue,
                            new PXSetPropertyException(Messages.NotConfigurableItem));
                        e.NewValue = row.DetailSource;
                        e.Cancel = true;
                    }

                    return;
                }

                if (this.ItemConfiguration.Current != null && row.Function != OrderTypeFunction.Disassemble)
                {
                    if (FieldVerifyingLinkedToSO<AMProdItem.detailSource>(cache, e))
                    {
                        e.NewValue = row.DetailSource;
                        e.Cancel = true;
                        return;
                    }

                    if (!IsImport && !IsContractBasedAPI && ProdMaintRecords.Ask(Messages.ConfirmChangeSourceDeleteConfigResults, MessageButtons.YesNo) != WebDialogResult.Yes)
                    {
                        e.NewValue = row.DetailSource;
                        e.Cancel = true;
                    }
                }
            }
        }

want to highlight on the screenshot:

Validations can be interpreted as: if not running through import/API, the user is prompted with the text of constant. Since .Ask method throws an exception, you see the error on mass processing screen. 

So, one of the ways, could be create a customization, that will padd this validation. 

Second point, since we have 

protected virtual void AMProdItem_DetailSource_FieldVerifying(PXCache cache, PXFieldVerifyingEventArgs e)

executed, it means that there was an attempt to put a new value into DetailSource. I have guess, that maybe in Prod Order DetailSource was not configuration, but something else.