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Explanation: I’d be a bit wary about assuming this is a deduction of 30%. French contributions are nearer to 60% than 30ù, so I’d be very surprised indeed if it turned out to be that. Further, from a grammatical point of view, the word “règle” would appear before the “30%” if the chosen suggestion were to work. Who knows, imagine there is an accent missing and it is meant to be “incl. 30% réglé” as the person has had a 30% advance on his salary for the month in question…
Just to be on the safe side, you might like to consider putting the question to your client. I may be wrong, but I cannot make sense of this as is and would prefer to play safe were this my piece of work – which it isn’t of course!!!