Make a dropdown label like phone type but not showing default value

Try adjusting your PXDefault attribute as follows:

[PXDefault("BCA")]

Hi ​@aleksandrsechin , thanks, The default value appears when creating a new form, but does not appear when editing the form. How can I make it appear?

Hello ​@mujib You can try this also:

[PXDefault("BCA;VA BCA", PersistingCheck = PXPersistingCheck.Nothing)]

I hope it works!

Hi ​@Abhishek Niikam , I have added the code PersistingCheck = PXPersistingCheck.Nothing but it doesn't work

​@mujib , the PXDefault attribute sets a value only when a new record is created.
If you open a record that was saved before the new field and its defaulting logic were added, the PXDefault attribute will not run.

Therefore, to set a default value for your new field on existing records, you will most likely need to do it via a database script, for example:

UPDATE BAccount set UsrVABank1 = 'BCA' where UsrVABank1 IS NULL;

As a result, all old records will have the default value.

If you want more control on it then use event (if you don’t want to modify DB):
 

protected virtual void _(Events.RowSelected<MyDAC> e)
{
    if (e.Row == null) return;

    var row = (MyDAC)e.Row;

    if (string.IsNullOrEmpty(row.UsrVABank1))
    {
        row.UsrVABank1 = "BCA;VA BCA";
    }
}

and I suggest you to increase field length to [PXDBString(20)], to handle it properly. 

Hi ​@Abhishek Niikam thanks for the advice👍

​@mujib, ​@Abhishek Niikam 

I just wanted to point out a couple of things that might be helpful:

1. The length of the combo box field should match the length of the underlying values (not the labels, and not the combination of value + label).
In your example, the values are “BCA” and “HSBC”, so their lengths are 3 and 4, with 4 being the maximum. Ideally, all values should have the same length (for example, 4), and you should also set the IsFixed = true property for combo box fields.
As a result, your PXDBString attribute should look like this:

[PXDBString(4, IsFixed = true)]

2. It’s generally not considered a good practice to modify a DAC instance in the RowSelected event. Acuminator even shows a warning about this.