Unused Fields in Table LIKP

Hello,

If you have seen the Delivery Note Table 'LIKP' there are four fields called 'TPQUA TPGRP STZKL STZZU' which have the description 'not currently in use', I have checked a couple of systems and I dont find these fields being used.

All I want to know is where are these fields located in delivery header transaction 'VL10A', cause my functional person would like to change these values in the transaction and not in the table. So could any of you kindly help me on this,

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