S.C. Code Ann. § 36-9-103
(a) In this section:
(b) A security interest in goods is a purchase-money security interest:
(c) A security interest in software is a purchase-money security interest to the extent that the security interest also secures a purchase-money obligation incurred with respect to goods in which the secured party holds or held a purchase-money security interest if:
(e) In a transaction other than a consumer-goods transaction, if the extent to which a security interest is a purchase-money security interest depends on the application of a payment to a particular obligation, the payment must be applied:
(3) in the absence of an agreement to a reasonable method and a timely manifestation of the obligor's intention, in the following order:
(f) In a transaction other than a consumer-goods transaction, a purchase-money security interest does not lose its status as such, even if: