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How to make a joint frictionless once you have modified the joint friction settings ?

Hello I'm trying to simulate a crate falling down an inclined plane to understand the basics of MSC Adams View. I added a translational joint between the crate and the inclined plane. If I leave the joint frictional settings unmodified (shown in screenshot attached), the joint acts as a frictionless joint but as soon as I decrease say Mu Dynamic from 0.3 to 0.2, friction gets activated. Interestingly there seems to be no option to deactivate the joint friction again. The only way I could remove joint friction completely was by deleting the joint (with modified frictional settings) and creating a new one.
 
Can anyone with more experience help me with this one ? Thank you in advance.
 
friction default settings msc adams