Sub Query Error

can you create functions?

also, what is the full version of your database?  (like 11.2.0.3  not 11g)

I can't create functions.  No rights.

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

as a side note,  if you have indexes on posting_date then

and trunc(sysdate) > trunc(posting_date)+14

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would be better written as...

and trunc(sysdate) - 13 > posting_date

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or, if the 14 is important

and trunc(sysdate) - 14 + 1 > posting_date

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the important part being to avoid using functions on columns in a where clause

These look like potentially serious performance problems to me:
1. "select distinct..." - Do you need the "distinct"?  That can add a big performance penalty, but this depends on a number of factors (size of the tables, size of your SGA, number of records that meet the criteria of the "where" clauses, etc.).
2. "trunc(posting_date)" - Whenever you apply an operator (trunc, upper, lower, to_char, to_date, trim, etc.) to a database column value, you prevent the use of indexes on that column, unless you have function-based index(es) that exactly match this syntax.  (The "trunc" on sysdate is no problem.)

Also, you have two references to: "trunc(posting_date)+14".  The second one is unecessary unless these two lines are intended to refer to different posting_date columns in two different tables.  But, then you will need a table alias with each one.

There are multiple conditions that are repeated but some of them are within an IN-clause and others are part of the overall where clause.

However, the IN clause references client as well as does the main query, so it's possible that there is some redundant access there.

That seemed to work.

I realize the query is not written well (it was given to me by someone else).  I'm unfortunately under the gun to do only slight modifications just to get it to work.   My only goal for now is a correct answer.

But I will most definitely revisit the performance suggestions.  

Thank you for all the help.

"I'm ... under the gun to do only slight modifications just to get it to work."

I like two responses that I've heard from co-workers in IT over the years to this line of thinking:

1. "If you don't have time to the job right this time, when will you have time to do it over?"
2. "How bad do you want it?  That's how bad you will get it!"

Mmm
testing bad queries is a bad investment
doesn't matter if you under the gun, if it's bad the trigger is pulled sooner or later

!! there are missing aliases for posting_date & inspection_status_id

and if it were my query I'd bee looking at something like the following (and even then I'm not happy):

SELECT
      manager
    , auditor
    , customer
    , account_number
    , state_abbrev
    , to_char(posting_date) AS posting_date
    , (    /* perform this fewer times AFTER the distinct is performed */
        SELECT COUNT(CASE 
                     WHEN TO_CHAR(posting_date + LEVEL, 'Dy') NOT IN ('Sat', 'Sun')
                        THEN 1
                     END)
        FROM DUAL CONNECT BY TRUNC(posting_date) + LEVEL <= TRUNC(SYSDATE)
        ) AS D1
    , deals_id
    , audit_interval
    , last_audit_date
FROM (
        SELECT DISTINCT    /* would prefer to remove 'distinct' if possible */
              p.last_name || ', ' || p.first_name   AS MANAGER
            , p1.LAST_NAME || ', ' || p1.FIRST_NAME AS AUDITOR
            , client.NAME                           AS CUSTOMER
            , deals.NAME                            AS deals
            , aut.account_number                    AS ACCOUNT_NUMBER
            , address.state_abbrev
            , trunc(posting_date)                   AS posting_date
            , aut.deals_id
            , client_deals.audit_interval
            , to_char(trunc(client_deals.last_audit_date)) AS last_audit_date
            
        FROM aut         /* use ANSI join syntax */
        INNER JOIN deals_address     ON aut.deals_id = deals_address.deals_ID
        INNER JOIN address           ON deals_address.address_id = address.ID
        INNER JOIN client            ON aut.client_id = client.id
        INNER JOIN deals             ON aut.deals_id = deals.id
        INNER JOIN client_deals      ON deals.id = client_deals.deals_id AND client.id = client_deals.client_id
        INNER JOIN AVI_QUADRANTS avq ON aut.avizone_id = avq.quadrant_id
        INNER JOIN field_manager fm  ON avq.TERRITORY_ID = fm.avizone_id
        INNER JOIN person p          ON p.ID = get_FM(fm.employee_person_id) /* don't like functions for joins */
        INNER JOIN person p1         ON P1.ID = fm.employee_person_id

        WHERE inspection_status_id IN ( 3, 7 ) /* where clause is vastly simplified */
            AND aut.client_id <> 100
            AND trunc(sysdate) - 13 > trunc(posting_date) /* a "sargable" predicate */
     )
 ;
 

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Very nice.  I really appreciate the rewrite, as well as the other comments and suggestions.

Huge help, PortletPaul!