I can not set service tag in dell bios

To who it may concern;
I have a Dell notebook model: 1015 with the service tag: 4LMxxxx
This notebook’s Mainboard has crashed so I changed it.
But after that I couldn’t set the service tag into the new mainboard. I mean after entering the service tag in the new motherboard it does not being save in the bios. Would you please help me in this case what should I do for that problem, to save the service tag in the bios?
With special thanks
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