Service Tag on Venue 11 Pro 7140 after unauthorized mobo replacement

Hello!

I bought on ebay motherboard for my 7140, it's marked as "new". I replaced it, everything works fine, except one little thing - tablet stops every time when it turns on and informs me that it hasn't Service Tag (ST). So it proposes to set ST or continue without it.
Question: can I use ST from my old motherboard ? Or from another broken motherboard ? Or from device of my friend with the same configuration? Because my current configuration not the same as my previous.