从例句的意思看，用in和用on没有什么区别。我还找了跟你句子相同的两个例句，请参考：

Business English is not included in the school curriculum.商业英语并没有包括在学校的课程里。

And it is this belief that leads us to include these arts in the school curriculum.正是这个观点,我们将艺术襄括进了学校课程之中。

我查阅了大量的资料，相对而言，使用on的时候比in多一些。例如：

Computer studies are now on the curriculum. 计算机学习现已列入学校课程。

English is the one compulsory foreign language on the school curriculum. 英语在学校课程设置中是一门必修的外语课。

The professor asked the students for feedback on the new curriculum. 教授征求学生对新课程设置的反馈。

In recent yearsa few similar courses have been appearing on the MBA curriculum. 近些年来,类似课程出现在MBA的课程表中。