the error message is talking about a field which you have not selected (I marked it green in your screenshot):
Those fields are open for maintenance in my system, can you please check the settings for them in the field selection for each entry in customizing transaction OMSX
I just tested it in my system and it worked like a charm.
I guess your system is not up-to-date with OSS notes. I see for example that your LFBW-WT_EXNR is still 15 long, while mine is 25 long
you may have to implement this note and probably even more: 2369535 - Segment E1LFBWM: new version of segment type for 'Exemption certificate number'
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