The folder field is a reference field and we do not support those in update workflow tasks (yet). Your current options are:
- custom workflow function: http://corebos.org/documentation/doku.php?id=en:devel:addworkflowfunction
- aftersave event: http://corebos.org/documentation/doku.php?id=en:devel:corebos_hooks#vtigerentityaftersave
- directly modify: Documents.php>save_module()
- custom workflow function: http://corebos.org/documentation/doku.php?id=en:devel:addworkflowfunction
- aftersave event: http://corebos.org/documentation/doku.php?id=en:devel:corebos_hooks#vtigerentityaftersave
- directly modify: Documents.php>save_module()
Joe
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