SAP Message 1Q501 - Required field not filled in route &2 in bank area &1

Diagnosis
When creating a new route definition in bank area &V1&, at least one ofthe fields Route &V2&, Bank country &V3&, or Bank key
&V4& was not filled for the executing bank.

System Response
The Customizing entry was not created.

Procedure
Cancel processing and create the entry again. Since the route definesthe next executing In-House Cash Center, none of the above fields mayremain blank.
The system checks if the clearing account for the bank area exists.However, you can leave this field blank temporarily while you aremaking your Customizing settings. The clearing account for theexecuting bank is not checked, since a different bank area isresponsible for it. You must therefore ensure that this account isvalid in your organization.