regarding access profile seting

Hi Champs,

I have a question.

if i goto to Object A and scroll down to Object B (related section) and click on New button, it throws access denied error

Object B is the related/child section of object A. Object B has can create access at the role level. however at the access profile level object B has read only access under Object A (which also has read only setting)

so my question is as a thumb rule the most liberal access profile will always apply.If this is correct then i should be able to create a new record for object B.