Can the mandatory field "Incoterms" be removed from the "Define Incompleteness Procedures"?

The customer would like to remove the "Incoterms" field from a mandatory one when selling domestically from a sales organization to their customer. However, they cannot do this due to that it's not configurable in Cloud for the configuration step "Define Incompleteness Procedures" (ID: 101189).

Besides, they are also wondering how it can be realized that the "Incoterms" field can be determined as "mandatory" or not according to the selling is "transnational" or "domestic".

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