allowredefinition

If this attribute is specified, redefinitions of task, resources or accounts are not flagged as errors. The primary use of this attribute is for projects that are created by merging sub projects which are again the result of sub project merging. In certain situations enclosing tasks, accounts or resources can be included in more than one sub project. This attribute then avoids the error message which is in most other cases a real user error. So use this feature with care as real errors might go undetected.

In case attributes of the same property must be specified in two different locations the supplement construct is the recommended way to do this.