(a) Subordination of security interest in transferred collateral. Except as otherwise provided in subsection (b), a security interest created by a debtor is subordinate to a security interest in the same collateral created by another person if:

1. (1) the debtor acquired the collateral subject to the security interest created by the other person;
2. (2) the security interest created by the other person was perfected when the debtor acquired the collateral; and
3. (3) there is no period thereafter when the security interest is unperfected.

(b) Limitation of subsection (a) subordination. Subsection (a) subordinates a security interest only if the security interest:

1. (1) otherwise would have priority solely under Section 9–322(a) or Section 9–324; or
2. (2) arose solely under Section 2–711(3) or Section 2A–508(5).