(a) Before we determine and certify payment. If we are informed by another Federal agency or instrumentality of the United States (other than the Veterans Administration) that a Federal benefit is payable to you by that agency or instrumentality based on the veteran's World War II or post-World War II active service before we determine and certify your monthly benefit or lump-sum death payment, we compute your monthly benefit or lump-sum death payment without using the wage credits discussed in § 404.1340.
(b) After we determine and certify payment. If we are informed by another Federal agency or instrumentality of the United States (other than the Veterans Administration) that a Federal benefit is payable to you by that agency or instrumentality based on the veteran's World War II or post-World War II active service after we determine and certify payment, we -
(1) Stop payment of your benefits or recompute the amount of any further benefits that can be paid to you; and
(2) Determine whether you were erroneously paid and the amount of any erroneous payment.