There is option to select and publish Isometrics in DGN or DWG format, but there might be requirements to publish both types and even publish same files in PDF format. Below mentioned steps will aid user to save Isometrics in DGN, DWG and PDF file formats. In below it has been described in context with AutoPLANT Modeler and OpenPlant Isometrics Manager. However, a similar approach would also worked with using OpenPlant Modeler and OpenPlant Isometrics Manager.
If above problem still persist, then please create a Service Request and contact Bentley Product Advantage group along with the list of all relevant details to get in depth analysis and for possible solution or workarounds.
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