Forums >> Revit Building >> Technical Support >> Group instances of the same type do not contain identical members

leedeetee

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Hi there,

Apologies for bothering you all again but I have another problem that I can't get my head around ....

I work for a modular building company and have created the standard modules that we use in groups, with a view to being able to copy them, or create instance as we need to increase the soze of the building space.

I thought I was doing OK but whenever I try to copy or right click > create similar I get the following message:

Group instances of the same type do not contain identical members.  Press "Fix Groups..." to select from options to make the groups consistent.Corresponding group members in different group instances diverge in the following respects:- different base heights relative to the group origin- different positions relative to the group origin

When I copy the groups over, the heaters and double sockets appear at a different height - this seems to be the problem? Why is this happening?!

Can anyone help?! I would attach my file but it's too big. :-(

Many thanks indeed.

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WWHub

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Groups have X, Y and Z origins.  The Z is your problem.  Use an elevation or section view to look at your group and make sure the z is here you want it.  I have seen people move this by mistake.    Then make sure you have the correct work plane set for the view you are in.

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teafoe5

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I'm assuming there are walls in your group?  When you copy and you try to hit "disjoin" on the options bar and see if that helps.  Your heater and sockets are changing height when you copy the group?  Are you copying your group to the same level or actually moving it vertially?

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leedeetee

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Hi tf5,

Yes, there are walls in the group. Unfortunately, when I copy, the 'disjoin' function is greyed out. And also, yes, when I copy or create similar, my heaters and sockets are moving up. I only ever try to copy the groups horizontally.

Thanks.

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leedeetee

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Hi WWhub, thanks for your reply.

Everything seems present and correct when view in section or elevation. I believe my work plane is also set correctly.

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leedeetee

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I've just copied the offending group into a new project and saved. (The file is attached)

Bizarrely, my sockets and heaters are now higher than they need to be, but I DO NOT get the aforementioned error message when copying/creating similar.

The elevation of my heater is showing at 986mm. No idea why?!?!

My FFL is 368mm and I have set the underside of the heater family to be 250mm. This must surely be the answer to it somehow, and (368mm x 2) + 250 = 986mm. Is this where I am going wrong? I can't figure out how though?!

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leedeetee

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I'm wondering now....

In my original file, I have set up the levels as the following:

02 Module Top (3144mm)

01 GF CH (2600mm)

00 GF FFL (0.00)

-01 Module Bottom (-368mm)

Hope I aren't muddying the waters, but, I think could be significant, even if I don't know how, yet!

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leedeetee

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pmartini2012

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I was having a similar dilemma in that when I grouped a mechanical family, a roof family, and a floor family and then tried to change the Origina Level Offset value by hitting the arrow keys, that warning would came up.  In my scenario, I had a mechanical unit (the mechanical family) sitting on a concrete topping slab (the floor family) and a wood-framed base (the roof family).  These units and their base had to be dispered throughout the entirety of the roofs at different elevations because of the slopes.  Interestingly enough, when I manually entered a value, this warning would not pop up.  I was having either issues, though, in that when I typed in the offset value, the topping slab and wood-framed base did not offset consistently, so the group was useless to me.

I ended up just removing the floor family and editing the Structural layers to include the topping slab.  Now there are only (2) types of families and (2) isntances of a family being grouped.  Once I did that, I was able to move the group by both using the MV tool or the arrows on my keyboard with no warnings or other issues.  The reason for originally seperating the topping slab and wood-framed portion into two families was for (perceived) greater flexibility with VG filtering and scheduling purposes.

Perhaps your dilemma has something to do with the fact that you're using disparate types of families.  Just my two cents.

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pmartini2012

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I was having a similar dilemma in that when I grouped a mechanical family, a roof family, and a floor family and then tried to change the Origina Level Offset value by hitting the arrow keys, that warning would came up.  In my scenario, I had a mechanical unit (the mechanical family) sitting on a concrete topping slab (the floor family) and a wood-framed base (the roof family).  These units and their base had to be dispered throughout the entirety of the roofs at different elevations because of the slopes.  Interestingly enough, when I manually entered a value, this warning would not pop up.  I was having either issues, though, in that when I typed in the offset value, the topping slab and wood-framed base did not offset consistently, so the group was useless to me.

I ended up just removing the floor family and editing the Structural layers to include the topping slab.  Now there are only (2) types of families and (2) isntances of a family being grouped.  Once I did that, I was able to move the group by both using the MV tool or the arrows on my keyboard with no warnings or other issues.  The reason for originally seperating the topping slab and wood-framed portion into two families was for (perceived) greater flexibility with VG filtering and scheduling purposes.

Perhaps your dilemma has something to do with the fact that you're using disparate types of families.  Just my two cents.

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