In checking the table I'm doing the query against, the PERIOD_YYYYMM is a text field so I'm not sure if your response with work in this case. Here is the query. Any other ideas?
SELECT
NOLDBA_INT_CASE_STATUS.IV_D_DO_CODE,
NOLDBA_CASE_ASSIST_TYPE.PERIOD_YYYYMM,
NOLDBA_CASE_ASSIST_TYPE.CASE_TYPE,
NOLDBA_CASE_ASSIST_TYPE.ESTABLISH_TYPE,
Count(NOLDBA_INT_CASE_STATUS.CASE_ID) AS [Case Count]
FROM NOLDBA_INT_CASE_STATUS INNER JOIN NOLDBA_CASE_ASSIST_TYPE ON NOLDBA_INT_CASE_STATUS.CASE_ID = NOLDBA_CASE_ASSIST_TYPE.ID_CASE
GROUP BY NOLDBA_INT_CASE_STATUS.IV_D_DO_CODE, NOLDBA_CASE_ASSIST_TYPE.PERIOD_YYYYMM, NOLDBA_CASE_ASSIST_TYPE.CASE_TYPE, NOLDBA_CASE_ASSIST_TYPE.ESTABLISH_TYPE, NOLDBA_INT_CASE_STATUS.CASE_STATUS
HAVING
(((NOLDBA_INT_CASE_STATUS.IV_D_DO_CODE)=[DISTRICT OFFICE]) AND
((NOLDBA_CASE_ASSIST_TYPE.PERIOD_YYYYMM)=[FOR YYYYMM]) AND
((NOLDBA_CASE_ASSIST_TYPE.CASE_TYPE) In ("A","F","N","M","X")) AND
((NOLDBA_CASE_ASSIST_TYPE.ESTABLISH_TYPE) In ("O","P","S")) AND
((NOLDBA_INT_CASE_STATUS.CASE_STATUS) In ("O","I")))
ORDER BY NOLDBA_INT_CASE_STATUS.IV_D_DO_CODE, NOLDBA_CASE_ASSIST_TYPE.CASE_TYPE, NOLDBA_CASE_ASSIST_TYPE.ESTABLISH_TYPE;