I’m trying to add a character to an invoice number in a list. If the invoice number starts with a 9 the letters “IT” should be added, in other cases the letter “P” should be added. I’m trying to get it to work in columns expressions, but I can’t find a solution to check with what character a string starts.
There is also the substr(string,start,length) to find a substring beginning at start position, consisting of length characters, where the first character is at start-position 0