How can we conditionate our Salary Amount by the Grade Ladder and Step

Summary

We need to conditionate the Salary Amount to a Step and Grade Ladder modifing

Content

When we have a hiring, promotion or something like that happen in the HCM Cloud we need de new Salary Amount obey the grade ladder steps default values. We trying to use "Salary" business object, "field modification" rule and  "Salary Amount" field.

We are doing tests at the "Promotion" screen, and at our logic just got take the values (grade_id, grade_ladder_id and others) present at emplyee assignment, don't at the previous session, were we deffine a new job, grade ladder, grade and step, like we need.