cl_abap_typedescr=>describe_by_name and field length

Hello,

When I run the method cl_abap_typedescr=>describe_by_name('MARA') on ECC6, the method works properly but the type definition for the field is wrong.

For example the method returns <b>mara-mandt type c length 6 instead of 3</b>. <i></i>

Is this normal ?