Create CAD Document using IOM API

Hi, How can I create and attach file with a  CAD Document through IOM API? Here is the code I am trying to implement. <hr /> // Create the CAd Document item var docItem = MyInnovator.newItem("CAD", "add"); docItem.setProperty("item_number", "CADDoc 004"); // Create the File item and set the path to the file. var fileItem = MyInnovator.newItem("File", "add"); fileItem.setProperty("filename", "My Document.docx"); fileItem.attachPhysicalFile("D:\\My Document.docx"); // Create the relationship between the CAd Document and File var relItem = MyInnovator.newItem("CADFiles", "add"); docItem.addRelationship(relItem); relItem.setRelatedItem(fileItem); var results = docItem.apply(); <hr /> I guess CAD files are null able type of relation since there is null value in related id column in CADFiles table...  
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