Using procedure in SELECT statement

Question

I have a select statement that currently uses 4 functions to receive necessary values. All the functions are recursive and returns values from the same row.
What I would like to do is replace these for function calls with 1 procedure. Does anybody know if it possible to use a procedure in this way inside a select statement?
If so, do you have the syntax for doing this?
E.g
SELECT
Mdbrd_Pkg.calculate_fixed_charge_fn(in_rc_id, ap.CONFIGSET_ID) AS FIXED_CHARGE,
Mdbrd_Pkg.calculate_charge_rate_fn(in_rc_id, ap.CONFIGSET_ID) AS CHARGE_RATE,
Mdbrd_Pkg.tax_liable_fn(in_rc_id, ap.CONFIGSET_ID) AS TAX_LIABLE,
Mdbrd_Pkg.charge_unit_fn( in_rc_id, ap.CONFIGSET_ID) AS CHARGEUNIT_ID
FROM .....

Answer 1

This cannot be done. The part of the function used in the SELECT statement is the return value: procedures don't have return values (that's what makes tham procedures and not functions).
Obviously I don't know what your code does, but you should consider putting them into a single function that returns a TYPE with four attributes and then using the TABLE() function to cast them into something you could reference in the FROM clause of a correlated sub-query. Sounds a bit messy though.
Do these functions actually select data? Where does the recursion fit in?
Cheers, APC