IN AN ASSEMBLY DRAWING I TRY TO EDIT DIMENSIONS OF A FEATURE. THE DIMENSION CHANGES; HOWEVER, THE FEATURE WILL NO UPDATE. IT MAY INDICATE THAT IT UPDATED; HOWEVER, IT DOES NOT. I ALSO HAVE A RECTANGULAR BAR IN THIS ASSEMBLY THAT I CAN NOT GET THE LENGTH TO CHANGE ON. IN BOTH CASES, WHEN I GO BACK AND EDIT THE FEATURE THE DIMENSION IS CORRECT; BUT, THE FEATURE STILL WILL NOT UPDATE. I TRIED EXTERNALIZING THE PART. WHEN I TRIED TO EDIT IT , IGOT A FETAL ERROR. IHAVE SP2 INSTALLED. HELP!!!!