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Yes, I realise that it wouldn't be the normal usage of "lump sum", but it could just be a literal translation - certainly the term in the question doesn't seem to be used very often, as I have only managed to find one reference to it, so it could be specific to one company only, and they could be using it incorrectly anyway! Perhaps the only way to be sure would be to contact the client directly for more information.
lump sum is opposite to unit price; it has connotation of price quoting, not summing, adding up or totaled value. In Internet: A lump sum is a single payment of money, as opposed to a series of payments made over time (such as an annuity). It could be an agreement where an owner .....
Reference information: The only reference I have managed to find is in the reference quoted below (scroll down to entry 94). It seems as though the term is used to refer to the practice of calculating a batch of insurance premiums all together at the end of the month, rather than doing them one by one through the month.