<br><font size=2 face="sans-serif">James,</font>
<br>
<br><font size=2 face="sans-serif">I can't see anything wrong with modifyCoefficients.
I have fixed OsiPresolve so if keepZero=true works for you - try
that.</font>
<br>
<br><font size=2 face="sans-serif">John Forrest</font>