Select Library Part Type
In the Check and Save Library Part panel:
Choose an option from the Select Library Part Type drop-down.

If you choose MEP Library Part, an additional pop-up appears: You must further specify the MEP type.

In the Check and Save Library Part panel:
Choose an option from the Select Library Part Type drop-down.

If you choose MEP Library Part, an additional pop-up appears: You must further specify the MEP type.
