Understanding Collection UDCs
Before you can define the structure of a collection, you must create the collection structure code in the 41F/CS UDC. You will specify the collection structure code to use when you define your collection structure.
Also, because a collection must be associated with a particular year and season, you must set up season codes and season years using the UDCs 41F/SE and 41F/SY respectively. Some examples of season codes are summer, winter, fall, and spring. However, the season codes are user-defined and not limited to these values. After you define the season code and season year values, you will specify the season code and season year to associate with your collection when you create the collection header.