Team, I tried to generate the signal in a separate layout, with a main bit rate 10M, to get a signal width of 10ns, then I saved it into a file (with the help of Save to file tool, from the library tools) then I went to my main layout, assign the bit rate to KHZ and imported the signal saved previously, by using load from file tool, any way, the loading is not possible because mismatching of frequencies as I read in the warning.