Where can I find the serial_number found on the sub-line ("cover_prid") in the tables?

I would like to be able to query all the contracts involving a given serial_number.  Hence, I'm looking for the location in the tables of the serial_number field shown on the contracts form on the Lines tab, Pricing/Products, Effectivity sub-line.  When I choose "Help/Examine" on the form field, it says the block is OKS_LINES_SERVICE_PRICING, and the field is "SERIAL_NUMBER".  I cannot find a table with that name. 

Does anyone know in which table I can find that serial_number from the covered line?

Thanks much.

Jennie