The rules that use the category "<ordinal-num_null>" are:

<company_id-not_creatable-num_null>

<ordinal-num_null> <company_type-num_null>

<section_id-not_creatable-num_null>

<ordinal-num_null> <section_type-num_null>

<platoon_id-not_creatable-num_null>

<ordinal-num_null> <platoon_type-num_null>

<battalion_id-not_creatable-num_null>

<ordinal-num_null> <battalion_type-num_null>