Check Out and Check in

Hi All,

I had checked out an Assembly file with out checking out the sub parts of it to make a change in the mates. But when I try to check in the assembly file it is asking me to save as all the sub parts of it. I had cancelled that dialogue box but as the sub parts in my assembly are of 60 nos so I need to cancel 60 times. Is there any procedure for checking out only assembly with sub parts of it and can modify the mates of the sub parts ?

Thanks in Advance