The upgrade from 5.0 to 5.1 does not require a data upgrade, only objects & executables.
The upgrade toolkit for 5.1 only contains a few bugfixes for the 5.0 upgrade toolkit
Debugging is twice as hard as writing code. Therefore if you write the code as cleverly as possible you are by definition not smart enough to debug it.
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Eric Wauters
MVP - Microsoft Dynamics NAV
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The upgrade toolkit for 5.1 only contains a few bugfixes for the 5.0 upgrade toolkit