problem with working on form with fields of many to many relationship tables

hello
hi guys
this is my first thread.actually i have a problem.the problem is that i have designed a database for my academy i have to save records of teachers of academy and courses taught in academy as well as records of batches of those courses taught by teachers, so i have made 3 tables which are
courses, teachers, and batches. i have a many to many relationship between teachers and course through the junction table batches but the problem is that i can't use the fields of all three tables in a form."can not update records" error is teasing me. please help.
thanks

No, you can't use all 3 tables in a single form. If I read your description correctly, you should have

1. Main form based on Courses.
2. Subform on Courses form for Teachers
3. Subform on Teachers subform for batches.