requirement calculation of material in process order

Dear Friends,

we have one raw material whose base unit of measure is maintained as CAR (cartons) and the unit of issue is in EA in material master.

now, when we create the process order of Header material, the system calculates the requirement qty of raw material in EA and this is properly shown when i click the material icon for the details of componen.t

but when i click the icon of material availability check the system gives the message as missing part list even if the current stock fulfills the reqmt. qty.

hereafter when we click the missing part list overview the reqmt. qty is calculated as per the base unit i.e. in cartons , it rounds of the figure obtained and re-converts to the unit of issue as in EA.

for eg.

one carton contains 1472 pcs EA

required qty of x material as per process order is 16000 EA ,

when we click on materials icon it shows the figure as 16000 EA correctly,

but now when we check for material availability and seee the missing parts overview , here the requirement qty is shown as 16192,

system calculates as follows:- 16000/1472 = 10.869 cartons,

here it rounds off to 11 cartons and equivalent of 11 cartons is 16192 EA.

so if, say for e.g. my stock of raw mat. is 16000 EA which can fulfill my reqmnt as per BOM but due to the above calculation shown the release of order is rejected.

please suggest for the issue to get resolve.

thnx in advance

rgds

Amitabh Rathod