If the production is included directly in another production, the number of the main production. The level of this production ...

If the production is included directly in another production, the number of the main production. The level of this production in the production hierarchy is displayed in the Reference level field. If no references exist, the current production number is displayed. If the production has a connection to another production, the field displays the level of the production relative to the main production. For example, if the level of the main production is zero, the derived productions are at level 1, level 2, and so on. If there are no references to other productions, the value is 0.
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