SELECTED ANSWER
replied on February 17, 2014
Louis,
%(Numéro de lot_) is not a valid multi-value token. I expect you meant %(Numéro de lot_All).
When you use multi-value tokens in text boxes, by default Workflow uses just the first value unless formatting or functions are used to convert the token into a string. Additionally, if you look at the syntax you pasted above, the search syntax expects the values to be in double quotes, delimited by commas and inside parentheses.
So, you can use a multi-value token in the search syntax you specified, but you have to format it so when Workflow replaces the token values you have the correct search query.
Something like {[Matricule]:[Lotissement](all) in ("%(Numéro de lot_All#[","]#)")}.