Try something like this. Posted Actuals come from ppa_wip table.
SELECT * FROM
(
SELECT PPA.INVESTMENT_ID PPAINVESTMENT, VAL.STDCOST STD, PPA.QUANTITY QTY, CAL.YEAR_KEY YEAR, CAL.MONTH CALENDAR
FROM NIKU.PPA_WIP PPA
JOIN NIKU.PPA_WIP_VALUES VAL
ON PPA.TRANSNO = VAL.TRANSNO
LEFT JOIN NIKU.NBI_DIM_CALENDAR_TIME CAL
ON PPA.TRANSDATE = CAL.DAY
WHERE CAL.YEAR_KEY = '2017'
AND PPA.TRANSTYPE = 'L'
AND VAL.CURRENCY_TYPE = 'HOME'
)
PIVOT (
SUM(STD * QTY)
FOR CALENDAR IN ('1' COST_JAN, '2' COST_FEB, '3' COST_MAR, '4' COST_APR, '5' COST_MAY, '6' COST_JUN,
'7' COST_JUL, '8' COST_AUG, '9' COST_SEP, '10' COST_OCT, '11' COST_NOV, '12' COST_DEC))
WHERE PPAINVESTMENT = xxxyyyz; (use a project internal id value here that has a cost plan that shows actuals. Note the year value as you may need to substitute.)