Hello @BI_6032169
You're facing here a current limitation related to the IDX format, and unfortunately still apllying to latest versions in production of Creo Parametric (including 8.0). Regarding what happens when IDX files are retrieved in Creo View, version 7.1 improves this for your info. This is documented in article 260644
ABove article was originally written for IDX coming from Mentor Graphics, marked as applicable later also for IDX files coming from Xpedition Layout, but good to know that you're able to deal with mounted holes in your context. Usually, the ecad_log file (generated in working directory after import of the IDX format in Creo) lists this kind of messages, confirming that this import is currentkly not supported:
Hole <XXX> is an embedded hole. Embedded holes are not supported, they are ignored.
And then yes, as @tbraxton said, if you choose the IDF format instead, you'll probably avoid the missing pin holes after import process, as long as you set the options we document in our article 183885
Regards,
Serge