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Per the ASME Y14.5-2009 standard Figure 3-4 (see below) a datum feature can be attached to a midplane. All my attempts only allow a Datum Feature to be linked to a surface. I can add additional references, and include the plane, but ideally, the datum feature would only be linked to a plane. Is it possible to do this in Creo 7.0?
I'm using Creo 4.0, but it may help assuming they haven't changed much regarding drawings. If you can't attach a datum tag directly to the witness line of the describing dimension, you may have to do an extra step.
1. Attach a datum tag to the dimension by selecting the dimension text.
2. Long-right-click and change the reference.
3. Select a witness line of the dimension.
That should do it. When you select a witness line, it defaults to the end of it to signify the midplane, but if you really mean just one side of it, you can click-and-drag it so that it's offset the dimension arrows, but still on the line.
I should have been more specific. I am trying to capture this in a MBD to send to metrology. I was able to attach a datum feature to a surface and then add the datum plane as a reference but upon export to STEP or being read in through another software using Creo APIs the information is lost.