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The Using drop down is populated with any property collector whose namespace matches the pattern defined by the PlasticSCM Plastic SCM plugin. The pattern for this action is ^plasticscm\..*
If you create a property collector for this action, make sure you select the Path Finder PlugIn type and give it a name that will match the pattern above in blue. Example names listed here, search the table's Plugin column for "PlasticSCMPlastic SCM".
For more in-depth explanations on property collectors see Property Collectors.
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