Hm. Nothing more that can be concluded from the info available.
We need more context, such as:
- the other lines for mp000200 in the table
- which entry does it seem to pick
- which fields are not showing/hiding as you would expect
You can also debug. Best place to start would be to set a breakpoint at the start of the coding of the ABAP generated by your feature to see whether that's really going where you'd expect it.
Regards
Sven