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Thread: Warning - Identical instances in a group w/ ghost instance- Revit 2019

  1. #1
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    Warning - Identical instances in a group w/ ghost instance- Revit 2019

    It's a multi-family project and this is our workflow.

    We have a unit matrix and we group every type of units so we can save as the group to separate unit Revit models. We link those separate unit models to the main building model. All the group only happened once in the Unix matrix model.

    Here is what we encounter:
    Warning: There are identical instances in the same place. This will result in double counting in schedules. You can tab-select one of the overlapping elements to exclude it from the group instance.

    First, I am not sure how that happens. It seems like it suddenly happened and we have 100 warnings about this. I don't believe we place two identical items at the same place, but wonder if it has something to do with instances' workset and group's workset. For example, we water fixture on workset "Unit Plan", but the group the water fixture is in is on workset "Workset1".

    Also, when I edit the group and try to delete one of the identical instances. There is none left after I just delete one. It seems like there is a ghost identical instance.

    I know the model group in Revit has some cons, but I've never seen this situation happened.

    Any thoughts? Thank you in advance!

  2. #2
    Moderator DaveP's Avatar
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    Next time you get the Warning, expand the Warning dialog box (There's an icon on the right side of it for that)
    Keep expanding that tree under you can see the description and Element IDs of the things it's complaining about.
    If the Description isn't enough to figure it out, write down the Element ID (yes, you have to write it down. You can't Copy it)
    Then Edit your Group and use the Select by ID tool on the Manage Tab.
    Type in the ID and you should be able to see the problem
    tidalwave1 likes this.

  3. #3
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    Quote Originally Posted by DaveP View Post
    Next time you get the Warning, expand the Warning dialog box (There's an icon on the right side of it for that)
    Keep expanding that tree under you can see the description and Element IDs of the things it's complaining about.
    If the Description isn't enough to figure it out, write down the Element ID (yes, you have to write it down. You can't Copy it)
    Then Edit your Group and use the Select by ID tool on the Manage Tab.
    Type in the ID and you should be able to see the problem
    Thanks, DaveP. I did do all those steps to fix the warning. I just wondering what causes it.

  4. #4
    Mr. Revit OpEd
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    Copy to Clipboard > Paste xxx is a common culprit and the user ignores the resulting warning.
    tidalwave1 and cganiere like this.

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    How do you search within nested families to find the culprit? Upon Inguiry, the message is "No good views".

  6. #6
    Member jsnyder's Avatar
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    Are you experiencing these errors in your unit matrix file or the building file? We do groups for MF projects and when this happens the usual culprit is when something inside the group (like a toilet) is hosted to something outside the group (like a floor). Since you are using links, I would suspect that the culprit is in one of your nested groups inside your unit links. What happens if you place another instance of one of the groups on a different level in your unit matrix file?
    You have to look for what object the error is referring to and work backwards from inside the groups.

  7. #7
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    We have these errors in unit matrix file, not in the building file. All our families are not hosted to wall, floor or ceiling. We did this on purpose to avoid some problems. After cleaning up last time, the warnings are gone for good. Hope not coming back!

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