This is used to create the correct array for the ELEX Dynamic Pricing Tool data import. SKUS are copied from the catalog rule module in Magento or can simply be a comma deliminated string. You need these product ids so that your can put a product on sale.
These were used for Clearances or other Promotions.
e.g., 75-3010,75-3111,75-3112,33-1078,15-46-472,15-49-701,15-49-702,15-49-703,15-49-707,15-49-716,15-49-719,15-49-731