Weight of product tip

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not a developer but a shop owner, trying to fix a minor thing to get back to normal business.


I have a problem with product tip. My shipping software gives me a failure if somebody is tipping because it is looking for a weight of this "product". 


So the software owner asked me to provide me the ?SKU?. I think what they really meant was the identifier for the the product tip "product", so that they can ignore it. 


Does anybody know what this is? or can help me how to put a zero for weight to the product tip ?


All the best,