Financial advisors and tax professionals may have lots to chew on with the business owners among their clients over the latest changes to the rules for business meals. But shifting tax statutes about noshing on the job have been causing heartburn for far longer. For example, in a lawsuit filed earlier this month in the Milwaukee federal court, Northwestern Mutual demanded a tax refund of more than $23 million that the giant insurer and wealth management firm argued it and thousands of employees at two co ...