Tiff with fusion mask

I can't import in C1 tiff files with fusion mask for adjusting layers. Layers with no fusion mask are OK. This a major outness because I sometimes finish editing in Photoshop and use fusion masks for adjustment layers and it is a bit stupid to be obliged to flatten the image before saving, wich means that I can't adjust anymore image parameters from previous editing. I think this should be implemented foar cataloging purpoises, otherwith that means that I need an external cataloging software, it also mean that I can't use C1 for cataloging because I can't have several software to catalog images and view them.

There is another raw converter / catalog software wich does it without problem...