Use EditFreeze in Assembly?

Hello,

i am trying to use the API Method EditFreeze, but i don't want to open every part document, so i run

through the whole model and put every part in edit mode.

After that i use EditFreeze:

Boolstat = featMgr.EditFreeze(swMoveFreezeBarTo_e.swMoveFreezeBarToEnd, "", False)

But this is not moving the freezebar to the end of the featuretree. Boolstat says "False"

The FeatMgr is from the modeldoc of the part in edit mode.

Anybody know why this isn't working?

Thanks for your help

SolidworksApi macros