In lesson 4 I created the sub form and inserted it in CustomerExtendedF. Although the stand alone form showed three records, the sub form , when inserted, showed only the first record.
I have downloaded the student database file for this lesson, and I am unable to find any substantial difference between it and my version in the form design.
I must be missing something but I can't find it.
Any suggestions?

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Reply from Alex Hedley:

The Link Master/Child Fields, what are they set to? Do they contain the correct ID Fields?