Payment method validation rule: resulting hold won't release after rectification

In r12, its possible to define a supplier site with payment method electronic but not provide any bank details. The EFT file then has null details where the bank details should be.

 

To prevent this I used a Payment Method Validation Rule to say that Payee Bank Account number is required. Where the data is absent, the payment schedule gets a hold ‘Document Payee Bank Account Number is required’ (screen shot uploaded). Even after providing the details, the hold won’t release.

 

On 12.1.3. Any advice appreciated