Attribute Precedence in Metaverse Designer

Hi All,

I have a small but confusing question regarding attribute precedence. I was under the assumption that if we set a particular MA precedent for an attribute which is contributed by say 2 other MA, then for the first time the value in metaverse can be populated by any MA but after that the MA that was set at the top precedence in the metaverse designer only can populate the value.

But what I noticed is, after any of the MA has contributed value for the first time, this MA can still continue to contribute value until the value is populated by the precedent MA. Once it is set, its only then the precedence concept comes into picture. 

Can someone guide me if i am wrong?

Thanks,

Veena