Expenses approvals based on DFF Value

Hi,

There is a requirement in expenses approvals based on DFF value. Please see below description and suggest if there is a way to achieve.

• Open a DFF at expense item (Professional Development Charges) and derive maximum sealing (Ex : $ 750) from employee record (we will derive this 750 value from employee DFF and we understood how to write SQL for this). Now we want to write BPM workflow expenses workflow rule - if expense type amount is less than or equal to 750 it should go for approval to immediate supervisor. If expense type amount is more than 750, it should auto reject. Please suggest how to achieve this requirement. We tried couple of options but none of them have worked as expected.