UserApplication 4.0.1

I am having a user creation form with following fields

In this WSINumber field if i enter the WSINumber in the field it should
do a validation by querying against the external database to make sure
it exist or not.
Is it possible to do it? If possible how can be done?

I thought about creating the WSINumbers in eDirctory and listing as
Static value in the form field, but we ruled out this option since this
WSINumber keeps changing so we thought of query the database directly.

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