4-digits bank code

"Your withdrawal request was cancelled today and the funds added back to your account for the following reason:

Please provide a 4-digits bank code of the beneficiary bank.

Please contact us directly for more information, or when the problem is solved, return to your XXX account to request your withdrawal again."

Nogen anelse om hvad det er for en 4-digit kode de vil have? Har oplyst swift code. Kan det være reg nummer de mangler?