Restrict Routing Number

Summary:

We would like to restrict the Routing Number to ensure that it does not allow any special characters and strictly accepts only 9 digits.

While we have implemented a validation through a VBS rule to restrict special characters, we are currently unable to enforce the condition that the routing number must be exactly 9 digits—either within the existing rule or through additional validation.

We are looking into possible approaches to enforce this requirement and would appreciate any guidance or recommendations on implementing a validation that ensures the routing number is limited to exactly 9 numeric digits.