Hi,All, I have figured out the mistake, for some reason some -h,-k,-l reflections were missed for the spacegroup given, so the program was not happy with the format. I donnot know how it happened since not me processed the data. Then another question is how the scale porgrams do with the situation that one of the friedel pair is missed? Does it discard these reflecions for the anomalous file and retain them for the isomophous file? Thanks!