How to Update the value of xClasss xProperty by AML or API?

Hi Eli, How to Update the value of  xClasss xProperty via API or AML? I can get the value of an xProperty  via MyItem.getProperty("xp-MyPropertyName") or AML. But I failed to update xProperty this way. Item MyItem = innovator.newItem("Part","edit"); MyItem.setID("xxxxxxxx"); MyItem.setProperty("xp-length","10"); MyItem.apply();   Lin    
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