After the 7th U.S. Circuit Court of Appeals agreed with William J. Burford’s argument that his exclusive sales territory agreement with Accounting Practice Sales Inc. wasn’t terminable at will, the company turned to a more complicated defense. On remand in Burford’s breach-of-contract case, APS argued it had good cause to sever its ties with Burford because he allegedly failed to satisfy its minimum sales requirement for four consecutive years.Burford countered by invoking the “mend the hold&rdquo …