Ok, but with both text and numerical values, it's not so simple : (how do you write arobase character in this forum , I can't do it ! ) say attr1 = 7 , and attr2 = 9 => come out is "79", it should be "7 bar 9". I found that if i add a "/" at the begining of the formula, the result is "/7 bar 9" (all right except the / is displayed !) Now keep the "/", but with attr2 = attr1 - 3 => come out is "/ 7 bar 7-3" , i would like "7 bar 4".