The most generated errors being found on Opencart forum originates from contributed programming. The increased post counters are caused by redundancies of the same solutions that were already provided prior.
Programmer / Opencart Tester
If you really need to do it by the SKU field, then Ultimate Shipping can do that. You can use an "Other Product Data" rule to set a set of SKU values to look for, so that it offers free shipping to any of those items. I can give you an example of how to set it up if you think that would work for you, just contact me at www.getclearthinking.com/contact.
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