Thanks at all and sorry for the late reply...
Can you post a picture of your whiteout?
In my opinion the citrus pastel is a combo of citrus X pastel. This is also what my breeding result shows (pastels, citrus pastels, citrus, normals). The citrus gene seems to be co-dominant or dominant (have to be checked). Maybe the whiteout is the superform of the citrus gene! Until now I don't know it...
Currently maybe my posted pictures are not visible, this is a problem of my server and I hope I can fix it today .
Thanks and best regards
Markus