How to assign a user as an approver of an "adjustment" of specific Transaction Type?

Hi there,

Trying to find how to assign a user as an approver of an "adjustment" of specific Transaction Type.

Below are the facts:

Transaction Type ==> XX

This Transaction Type has a Late Charge Schedule attached to
it.  That is, if the Customer does not pay in a given time frame he is
charged Late Charges.

Late Charges are ADJUSTMENTS.

Late Charges Generate Prog. (for the specific Transaction
Types) is scheduled to run on given dates by a USER, who works on these
specific Transaction Types.

USER who scheduled the Late Charge Generate Prog. MUST be an
APPROVER of these ADUSTMENTS in order for the Late Charges to be applied on the