Optional filter expression when mapping MPI fields
If you are mapping a field from the MPI table into this field, you can control when the mapping occurs by specifing an optional filter expression. If the value of the filter expression returns TRUE, then the mapping will take place, otherwise no mapping will be done.
Optional string expression that will be applied to the value before it is mapped in from another table
Use this to alter the value of the field before it is mapped in from another table.