Firstly, remember that all of us Forum Ninjas here in this forum are not employed by Wix themselves, we are only doing this in our own time so it will vary between us all as to when we are all on and at any given time.
So all of us forum ninjas do this for free and if we are busy with our own work or away on holiday with family for example, then our heads and minds will not be thinking about this forum. As like myself with it being school half term and myself taking family away on hols, so I am not going to spend all my free time on a forum and neglecting my holiday… 
Yes, as you are using the reference field etc, you need to be using the Wix Data Save function and not the Wix Dataset Save function as Wix Data lets you play with the reference fields,
https://www.wix.com/corvid/reference/wix-data.html#save
However, as you are only inserting the one item, then you can just use the Wix Data Insert instead of using the Wix insertReference.
So use https://www.wix.com/corvid/reference/wix-data.html#insert
Instead of https://www.wix.com/corvid/reference/wix-data.html#insertReference
You can see more in this previous forum post here too.
https://www.wix.com/corvid/forum/community-discussion/wixdata-insertreference-not-working-with-single-reference-field