hello - i would like to know if there is any way to lock out an assembly to keep other members of the engineering dept. from

changing parts, colors, etc. within the assembly -

we seem to have a problem of detailers changing parts and or colors, etc. in assemblies or designs that have been approved by

the managers or supervisors - this problem has happened 3 times within the past 4 months - we are working in 2009/2010

release - any help or info would be greatly appreciated - thank you