Interlaced to Progressive AVCHD / AVCCAM AMA

Hi,

I got Clips from a Panasonic AVCCAM (AVCHD) which are filmed in 1080/25p

Avid 7 sets the clip linked via AMA to 1080/50i (interlaced) and interprets the clip like this.

You can see at edges and lines, that avid interprets it as interlaced.

When I watch the clip with a Tool that interprets the clip correctly as 1080/25p, the edges and lines are clean.

How can I say Avid to interpret that clips correctly as 1080/25p ?

When I use "Source settings" in the Bin, I can't change field order. The tab "AMA Source settings" is not there at that AVCCAM Clip.

Thanks for your help.

Ingo