On Thu, 26 Mar 2020, at 04:23, Bruce Hewson wrote:

> So far I have not seen anyone identify where this is fully documented.

Apart from the documented behaviour of MVSVAR (which I found with Google)
there's maybe the point that in your code you've got single quotes around 
"mvsvar".  That, IIRC, suggests an external function.  

You might be calling a local (ie your site only) modfied version of mvsvar().

-- 
Jeremy Nicoll - my opinions are my own.

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