Overwrite workflow version in 4.6c

[Elias Bergan]

Hi all!
 
Do you know if it is possible to overwrite an already started workflow version with an updated workflow version in SAP 4.6c? We want the old workflow processes which are not finished to proceed with the new workflow version. The change we want to make to the old workflow is to increase the values of 'Requested start' and 'Latest end'.
In advance, thanks for any help!
 
Elias