Following are requirement for a ListPage form:
1. Created custom listPage.
2. Imported legacy data on the listPage from excel using DMF tool.
3. How do I set up or filter data on this listPage  by using a "date" range of some sort to disable old records from editing? For example, for all the records that are from Sep 1st ,1998 to June 24, 2015, I want it to be non-editable when a user clicks on it. I would like all the fields to be greyed out. 
 I'm not sure how to go about this? What method to write or where to write it? ListPage form method or Detail Form method? I've build 3 custom forms.  Create Form to create new entry, Detail Form to view or edit existing entry and finally, a listPage form where all the records are shown in the grid. 
Any help will be greatly appreciated!. 
Running AX 2012 R3. 
  
                            
                         
                        
                        
                            
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