Hi,
thanks for this, You were right there were .WT parts in production which i have put into production change.
But as i tried to fix this the 13 instances undid check out and reverted back to instances under the old family table 1.8. And 1.9 also exists.
Family Table 1.8 has the originally 20 instances on it, 7 of them 'ghosts' of the now stand alone CAD and 13 of the other instances.
Family table 1.9 exist with nothing under it. 1.9 can not be deleted as it is being used but other assembly drawings now.
can you suggest a solution to this.