MediaTailor relative program issue

Hello I am having issue while scheduling program with mediatailor. I have schedule a program (i.e Program A) for next week and now I am trying to schedule another program (i.e Program B) for this week but I am getting error. I am passing "Program A" as relative program for "Program B" and I am getting this error:

You tried to use [Program A] as a relative program in channel [abc-channel]. You can't use programs that are currently playing or scheduled to play soon. Choose a different relative program.