This error message seems a bit self-contradictory: That operation is not supported for this type of UI object: select. It is only supported for type: select

AI generated answer (using internal Slack threads):

Based on the conversations, it seems like the error

SSS_INVALID_UI_OBJECT_TYPE That operation is not supported for this type of UI object: null. It is only supported for type: null.

is being encountered when trying to use the

field.removeSelectOption()

method in a client script to delete a selected item in a serialized item type field. The

field.removeSelectOption()

method is not suitable for this field as per the NetSuite documentation. This method has certain limitations and it's not permanent, meaning the select option will be available the next time you load the record. To prevent a user from selecting an option that has already been selected, you might need to implement a different approach. However, the threads do not provide a specific solution for this. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******