RTC 2009R2 Sales Order Item Tracking lines Problem

Hi everyone ,
I have a problem with the 2009R2 RTC. I created a Sale order and added on sale line 3 times the same item with quantity 1 . Then i went to actions , Item tracking lines and gave to each a different Serial No. (1st has Serial No. 123 ,2nd 234 and third 345) . When im checking Item tracking lines from Classic everything is correct , but on RTC it keeps the previous line i checked (f.e. checking the 1st line and Serial No. is 123 after that the 2nd and still 123, checking again the 2nd line and it takes the correct Serial No. 234) Both form and page has the same code and using the same functions . I really appreciate any help you can provide.