Hi All,
we upgrade CRM from 2015 to 365 v9 on premise after upgrading while we try to save case record it saved but make Contact field after saving "null"
after debugging the js we found that js after calling save function has crash on ClientAPIwrapper.js and formcontrol.js
so one of our solution is convert Form in Legacy Mode
Settings >> Adminstration >> system settings >> make form use legacy render = Yes
the above is solve the problem
but we don't need to use legacy mode so any suggest for solving the issue ?