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XY data has already gone through both steps of the projection process. In other words, the location is calculated to a reference datum-dependent LatLon and then to a coordinate system-dependent XY. Without latitude and longitude, Petra can't use the project's coordinate system to recalculate correct XY values. Therefore, when importing pure XY data, it is important to make sure both the reference datums and coordinate systems match.
Petra can recalculate the XYs of data inside a project including well locations, and overlays. Instead of changing an entire project to the data's projection only to import the new XY data and change the entire project back to the old projection, a less risky way is to create a new, temporary project in the new data's projection.
First, create a new project using the new data's map projection. This project doesn't need to include any of the old data from the old working project. Next, import the new data into that temporary project. Petra now has the data and can calculate LatLons from the XYs. Next, change the temporary project's projection to be compatible with your full project, making sure to recalculate the locations. Finally export the data out of the temporary project. This leaves the new data in a usable projection. Finally, import the newly-reprojected data into the full project.
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