Dear SAS-Community   I'm failing with a problem that actually sounds not very complicated: I have a data table of the form as I've attached. For the case that you cannot open it, it looks like this:   Code    year     value 10        2015    375 10        2016    640 10        2017    710 20        2014        0 20        2015    125 20        2016    950 20        2017        0     What I like to do is the following: If the value of the line with code = 20 and year = 2017 is zero (as in my example), then I like to set the values of code 20 (only code 20!) for all years to zero. In my example this would mean that instead of the values 125 and 950 there should be written zero. I'm very grateful for every help!   Best regards, Leo ... View more