"minEnclosure" constraint for layer "M1" and layer "CA" is deprecated problem when setting up minimum enclosure distance in the layout's technology file.

Hi All,
I want to set the minimum enclosure distance between layer "M1" and "CA" in the layout using the SKILL ommand,
techSetOrderedSpacingRule(tfId "minEnclosure" 0.7 "M1" "CA"),
but I got  Warning message in CIW like these,
*WARNING* (TECH-230024): techSetLayerPairConstraint:
                         "minEnclosure" constraint for layer "M1" and layer "CA"
                         is deprecated. You should use "minOppExtension" with the same
                         value for two extensions. For backward compatibility,
                         the constraint will continue to be stored in the database and will be
                         accessible with APIs. When the technology database is dumped to ASCII,
                         it will be dumped with the correct mapping("minExtensionDistance").
t


I'm using IC618, please help.


Best regards,
Marben