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You will notice that not all dRofus Attributes or Revit ArchiCAD Parameters are writeablewritable. The following examples outline the limitations when attempting to write to Attributes attributes or Parametersparameters:

• dRofus System Attributes: The half-toned Attribute highlighted attribute and buttons below indicate that the dRofus attribute called "Last synchronized date and time" is a System Attribute system attribute and therefore cannot be written to - i.e., "Link <--" is not possible. It also suggests that becaue because this value can keep changing, it is not to be used as the Key Attribute attribute used for comparing - i.e., "Link ==" is not possible:

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• Revit ArchiCAD System Parameters: The half-toned highlighted parameter / buttons below indicate that the Revit Parameter ArchiCAD parameter called "Model Name (dRofus)Current date and time" is a System Parameter system parameter and therefore cannot be written to - i.e., "Link ==" and "Link -->" is not possible:

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• dRofus Calculated Attributes: The half-toned Attribute highlighted attribute / buttons below indicate that the dRofus Attribute attribute called "Designed - Programmed" is a Calculated Attribute calculated attribute and, as such, cannot be written in to - i.e., "Link <--" is not possible. It also suggests that becaue because this value can keep changing, it cannot to be used as the Key Attribute attribute used for comparing - i.e., "Link ==" is not possible:

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• Revit ArchiCAD Calculated Parameters: The half-toned Parameter highlighted parameter / buttons below indicate that the Revit ArchiCAD Parameter called "VolumePerimeter" is a Calculated Parameter calculated parameter and, as such, cannot be written to - i.e., "Link -->" is not possible. It also suggests that becaue because this value can keep changing, it cannot be used as the key Key attribute used for comparing - i.e., "Link ==" is not possible:

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• User Permissions on dRofus Attributes: Depending on the User Permissions of the User that is logged in, the User may, or may not, be able to carry out writing to certain dRofus Attributesattributes. For example, if a User has Level 2 permissions for Rooms, this means that that User will not be able to write in to any of the fields within the Room Core Properties properties, such as "Room Name", "Room Number", "User Room Number", "Designed Area", Ceiling Height" etc.