Conversion table problem (unstructured FM to DITA, cannot create valid choicetable)

Hi there,

I am trying to set up a migration table FM to DITA. I was able to map most of my tables to the CALS style table suuported in DITA, but I can't get choicetables right.

My problem is the FM-specific element for the table body.

This is from my conversion table:

And this is what I get:

Where is my mistake? I tried several variations to get fm-chbody, but the result is always the same.

Thanks for any help

Susanne