How to assist your home university in evaluating whether classes taken when studying abroad should allow transfer of credit?
Submit the course (or module-) descriptions for the examination department/office.
The target university needs a basis for their decisions to make.

A description of the course containing information about the topic (a syllabus), learning goals and skills taught, the workload and the examination conditions, will help to decide whether a course fits into your major or not and if it can be granted with transfer credits and so on.