I've been into the use of "any" in positive sentences, and I crossed that this sense of "any" can also be used with "whatsoever" to add emphasis, such as:
- If you have any query whatsoever - it doesn't matter what it is - please ask me.
Nevertheless, I think that "whatsoever" is just used with negative sentences to add emphasis, and "any" in this sense is not indicating anything negative, so why is "whatsoever" used? and wouldn't it be better to use "whatever" instead?
Here is the link where I found that sentence: https://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv303.shtml