You probably know that it is possible to import NAV2009+ objects into a NAV 50SP1. At least if your 50SP1 has build 30488 or more recent.
But what you maybe don’t know is that there can be a problem anyway.
I had the following error:
There are errors in the text conversion (text no. 165-205 does not exist in the .stx file).
Internal error: 47-1
AUW! That hurts!
The reason is that not all NAV2009-info is deleted in the tables. I exported the fob as text (using NAV2009+) and checked everything.
I found these lines:
Removing these lines and imported it into NAV50SP1 fixed the problem.
Not really beautiful as a sulution, but at least it worked. Just hope you don’t need to do it too many times.