It is impossible to create an ordered list with whitespaces and a text between list items, e.g.:

-# Item 1

    Text of Item 1 with 4 spaces (1 tab)

-# Item 2
 
    Text of Item 2

gives the following result:

1. Item 1

    Text of Item 1 with 4 spaces (1 tab)

1. Item 2
 
    Text of Item 2

But http://www.stack.nl/~dimitri/doxygen/manual/markdown.html#mddox_code_blocks tells that:

"Note that list markers are not counted when determining the relative indent:

1.  Item1

    More text for item1

2.  Item2

        Code block for item2

For Item1 the indentation is 4 (when treating the list marker as whitespace), so the next paragraph "More text..." starts at the same indentation level and is therefore not seen as a code block."