This is an area for discussion around the published NASBA Article linked and cited below
Summary: Sponsors need to be consistent in the breakdown of CPE credits and when there are multiple fields of study. In practical terms, for a course containing content of 140 minutes in more than one field of study, the Sponsor must first determine to offer two and four-fifths credit, or two and one-half credit. Next, if the course has more than one field of study, that breakdown must be consistent with the use of the one-fifth or one-half increment and any overage of CPE credit that does not fit correctly using the breakdown that can be moved to the primary field of study.