Assets data migration question - LSMW

Hi guys,

The client needs a bunch of enhancement fields in the assets master data record.

When I used LSMW to make a batch in put, after I maintained the source field I found that there is only BALTD and BALTB in the structure relations which means: I canu2019t find the enhancement fields in the u201Cfields mapping and conversion rulesu201D.

How can I add other structure which includes the enhancement fields into the structure relations?

PS: I don't want to record the screen coz there are over 40 enhancement fields and they appear everywhere depending on the assets class. So it would be the last choice to do it by recording the screen.