The issue can be recreated fairly easy with the savefile provided, and a little patience (10-20 mins)
First, go to my URV production fac. You will find it has roughly 250K cr. Not exactly a rich station

Then you will find it has plenty of drones not really being used or sold. This was how I discovered this. I wanted to do something with those drones, and decided to let the URV station have some drones installed for defence. I figuered that since it would basically sell its own wares to it self, it wouldnt need any money. How right I was

Now, go to the construction vessel assigned to the station (Gemstone: URVparts - Const) and have it add 80 Overrun Mk2, 60 Interpid Mk2 and 100 Intercepter Mk2. Finish the trade and then you will have to wait... anywhere from 10 to 20 minutes in my experience. Tried it twice.
You will find that one of my managers proudly asks if you want the money she is holding, and then... Well, somwehere between 8 and 11 mills will be transfered to the player account.
As it turns out, looking into the log, this is the URV station (owing 250K) receiving a profit from the URVs it just sold to itself Oh, and apart from the money transfered to the player account, they also improved their own account in the process... How on earth those money suddenly got there, I dont know... But I do thank the very capable URV Manager of producing money from nothing. And we all said Managers were hopeless

Some screens of all this below, they are put in order roughly corresponding to the explanation above:
http://shares.fenhris.dk/s#6fd896c1-c4f ... %20add.jpg
http://shares.fenhris.dk/s#1853c080-207 ... %20add.jpg
http://shares.fenhris.dk/s#80ef24fb-3f4 ... %20Add.jpg
http://shares.fenhris.dk/s#80ef24fb-3f4 ... %20Add.jpg
http://shares.fenhris.dk/s#874954f3-d8c ... 20mins.jpg
http://shares.fenhris.dk/s#df6bce85-730 ... %20Add.jpg
http://shares.fenhris.dk/s#54293975-676 ... %20add.jpg
http://shares.fenhris.dk/s#4a157359-82f ... 20Add..jpg