2 Replies Latest reply on Dec 29, 2015 7:24 PM by cyccyc621

    NEEDED_How to implement this function


      Hi, Dear all,

      I started my rental system with In records and Out records posted below:




      Now, I want to implement a function:


      I don't know how to realize it. Or I'm in a totally wrong way. Should I break it into tow portals for each kind of records, and then do a calculation?

      I need help. Thanks you!


      Best regards,