Hi, I have an existing assembly (not done by me), which contains 3 parts, which have been shrinkwrapped. I am trying to do something fairly simple, but for some reason I can't seem to be able to. I would like to create a datum axis in the assembly at the intersection of two of the datum planes of the assembly. The purpose of this axis is to redefine the constraint between one of the part and the assembly. However, when I try to add a datum axis, I can select one plane as a reference (through/normal) and one other as an offset reference (if the reference is normal), but I can't seem to be able to add any more and the OK button is greyed out, so the only thing I can do is "cancel"
![](https://community.ptc.com/legacyfs/online/emoticons/sad.png)
Sorry if I'm being dumb and this is really easy, I'm (very) novice. Many thanks in advance, Arnaud
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