"The functions whose names end with _ADD return the same results as the corresponding Microsoft Excel functions. Use the functions without _ADD to get results based on international standards. For example, the WEEKNUM function calculates the week number of a given date based on international standard ISO 8601, while WEEKNUM_ADD returns the same week number as Microsoft Excel."
from https://help.libreoffice.org/Calc/Add-in_Functions,_List_of_Analysis_Functions_Part_Two#CONVERT_ADD is party wrong. When removing _ADD from CONVERT_ADD (resulting in CONVERT) I get a currency changer. At least says this the ONLINEHELP at https://help.libreoffice.org/Calc/Mathematical_Functions#CONVERT
What is wrong? I think the latter from the description in the wizard...
Let's set to NEW.
The specific CONVERT case has been fixed in master with http://cgit.freedesktop.org/libreoffice/help/commit/?id=5c2654302e9e4dcf45f802e8d31e53f55251c367
See also bug 69539.
For other the current "The functions whose names end with _ADD or _EXCEL2003" is correct.