Courses with Lecture and Non-Lecture credits need to have a section open for both components, otherwise the students will receive an error when registering. These are typically referred to as Lecture/Lab Sections.
In Maintain Schedule of Classes on the Basic Data Tab click the '+' sign (highlighted below) to add a new section.
Type 05L in the Class Section box.
Change the Component box to LAB.
Type 9999 in the Associated Class box.
The following message explains that the Class Type is being changed from Enroll to Non-Enroll.
Change the Associated Class box to 5.
The lab section is open. Continue filling out the rest of the tabs (if applicable) and approve the section.