The WP New header command creates and returns the header associated to the section or subsection defined by the wpSection parameter. 
If a header element is already defined for the section or subsection, an undefined object is returned and an error is generated. 
You want to create a header for the right pages of a section:
 C_OBJECT($section;$subsection;$header)
  
 $section:=WP Get section(wpDoc;1)
  
 $subsection:=WP Get subsection($section;wk right page)
 
  
 If($subsection#Null)
    $header:=WP New header($subsection)
 End if