If you selected "family based" when you filed I-485, your receipt should be "derivative". However, if you selected "others", then your receipt is "others". Anyway, I donot know whether you shold worry or not.
Maybe it is your mistake!
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                    Thanks llliii, hope I am over worried, but I found
                     -gc666- 
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                        10/06/2006 postreply
                                                12:46:25
                    
                    
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                    I would suggest you to double check the copy of
                     -llliii- 
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                        10/06/2006 postreply
                                                12:53:38
                    
                    
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                    Thanks llliii, I have checked the 485 copy. part 2 application
                     -gc666- 
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                        10/06/2006 postreply
                                                13:23:34
                    
                    
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                    It seems that you make mistake on category. You should
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                        10/06/2006 postreply
                                                14:02:46
                    
                    
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                    Thanks mytwocents, I check 485 application, both of us
                     -gc666- 
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                        10/06/2006 postreply
                                                14:14:02
                    
                    
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                    Your husband should select a, you should select b.
                     -mytwocents- 
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                        10/06/2006 postreply
                                                14:31:12
                    
                    
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                    thank mytwocents.
                     -gc666- 
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                        10/06/2006 postreply
                                                15:02:18