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Variable names must be unique within a group.
When specifying the variable name in the Database Variable Definition screen, the DB_ prefix is assumed and should not be specified.
When referring to a Database variable from within a rule definition, the DB_ prefix is not assumed and must be specified.
The specified group name becomes an assumed prefix (attribute) of the variable name. When a rule definition refers to a variable within the current group, the group name does not need to be specified. When a rule definition refers to a variable from another group, the group name must be indicated explicitly.
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