FIFO - Fill Ratio calculation Purchase order vs GRN

[#1]

Hi,

I am trying to load purchase order schedules and correspoding Grn (goods receipt note) tables, 

Following are the table data

Purchase Order Table

PO NO	PODATE	QTY	SCHEDULE DATE
4400062680	2012-07-05	5750	10-Aug-12
4400062680	2012-07-05	5000	20-Aug-12
4400067840	2012-11-20	670	19-Dec-12

GRN Tabel

PO NO	GrnNo	Date	GateQty
4400062680	5000398459	12-Jul-12	2500
4400062680	5000401805	23-Jul-12	3500
4400062680	5000402948	26-Jul-12	3300
4400062680	5000403243	27-Jul-12	2200
4400067840	5000441410	25-Dec-12	500

I want to generate a result table as follows in load script

PONO	GrnNo	Date	GateQty	FILL RATIO	NO OF DAYS
4400062680	5000398459	12-Jul-12	2500	43.48	-29
4400062680	5000401805	23-Jul-12	3500	104.35	-18
4400062680	5000402948	26-Jul-12	3300	66.00	-25
4400062680	5000403243	27-Jul-12	1700	100.00	-26
4400067840	5000441410	25-Dec-12	500	74.63	6

The Fill Ratio is calculated based on first schedule of the same PO number, once the scheduled qty is completly received, it should consider next available record for the same PO.,Same way the no of days is also calculated

.

Thanks in advance for your help

Sajith. T