I have tried to produce two page layouts that seems to be alike. But when seen as a Partner Portal user some records won’t show. I can’t find any fields that should limit this because, as far as I can see, PP access is granted on all relevant records and fields.
Below is my view. I can see more records than PP-user (the ones circled) and I also can see subrecords (price history lines)
PP-user first product to be seen is my fourth and the sub(?)record won’t show anything but headlines.