ECM/OCM PROBLEM

HI FRIENDS,

IN TRANSACTION <b>CC01</b> WHEN WE GO TO OBJECT TYPE USING <b>'WITH RELEASE KEY'</b>, WE FIND CHECK BOXES IN FRONT OF BOM, ROUTING, REFERENCE OPERATION SET ETC.

NOW MY QUESTION IS WHY THERE R NO CHECK BOXES IN FRONT OF MATERIAL. DOES IT MEAN WE CAN NOT CHANGE MATERIAL WITH RELEASE KEY. IF NO.......... WHY?????? PLEASE EXPLAIN....

AGAIN WHEN WE GO TO <b>CR02</b> THERE IS NO FACILITY OF ENTERING CHANGE NO. ALSO WORK CENTER IS NOT THERE IN OBJECT TYPE LIST IN ECM. DOES IT MEAN WE CAN NOT CHANGE W/C WITH CHANGE NO????????WHY????????????