Hello
As Mangalraj said, there is no finite capacity checking during the MRP run.
This functionality can only be found on production planning made by SAP APO.
Check the link below for more details:
http://help.sap.com/saphelp_ewm70/helpdata/en/a5/8b623c8a6da167e10000000a11402f/frameset.htm
BR
Caetano