Equvailent Expression for Multiple Field Foreign Key Construction in SBM

Hi All,
I have difficulties in translating the ER-Digram model to the SBM Single relational Model

Form Details Table
-- Main Form (PK)
-- Form Line (PK)
-- Version (PK)

and I have a process table

Form Details Process Transition Table
--Main Form(PK, FK)
--Form Line (PK, FK)
--Version (PK, FK)
--TimeStamp (PK)
--Action
--User


The Form Details should be with Form Details Process Transition Table with 1:M relationship, and which the Form Details Process Transition Table should be retrieved via Form Details' Multiple Field Primary Key.
So User should be able to select all the Proces Transition by Providing Main Form, FormLine and Version

How should this expression be translated in SBM logic?

Thanks,
Derek