ComboBox Validation not working on Update mode on the first selection

Hello Experts,

Just a quick one. I created a B1 UP Validation on Delivery Mktg. Doc. The said validation will populate the web link on a field. See the below setup:

FormMode: All or Add/OK/Update

Event: Combobox Select

BeforeAction: Ignore

ActionSuccess: True

ItemChanged: Ignore

InnerEvent: Ignore

BubbleEvent: Ignore

The said validation is working on the add mode. But it's not working in the update mode.

When I click the dropdown and select data, the field for weblink doesn't update. But when I select again other data or the same data it populates the weblink field. The expectation is that when you select data from the dropdown for the first time it will automatically populate the weblink field.

Thank you.