The Change Associated Element function on the EO Working List Tools menu works as follows:

1. If no EOs associated with the Element you're switching TO have the same EO Numbers, the old EO Numbers are retained. For example, you move EOs 2, 7, 10, and 19 from Element A to Element B, which had no existing EOs. The EOs associated with Element B will be numbered 2, 7, 10, and 19.

2. If some of the old EO Numbers clash with those of EOs for the new Element, numbers that clash will be reassigned the next available EO Number and others will be retained. For example, you move EOs 2, 7, and 10 from Element A to Element B, which has EOs numbered 1, 2, and 3. Old EO Number 2 gets changed to 4, and 7 and 10 retain their numbers. The EOs associated with Element B will be numbered 1, 2, 3, 4, 7, 10.

3. If all the old EO Numbers clash, they all get renumbered starting with the next available EO Number for the new associated Element, but not backfilling any gaps.

If you add new EOs to Element B in scenario 1, they will get consecutive available numbers, starting with 1. (e.g., 1, 3, 4,5,6, 8, 9, 11, 12, etc.)
If you add new EOs to Element B in scenario 2, they will also get consecutive available numbers (e.g., 5, 6, 8, 9, 11, 12, etc.)

If you do not like having large gaps between nonconsecutive EO numbers (as may be created in scenarios 1 or 2), you can change the EO Number of one or more EOs by doing an SQL update after running the "Change Associated Element" function. Any subsequently created EOs will be assigned the next consecutive number. There is no need to update the NEXT_EO_NUM seed table.