In this case, SW AMT is reserved for "crossover" relationships between characters in different parts of the SW franchise.

However, if a character appears in multiple eras and you're fine with all of them, you can either request one and specify in your optional details that you're good with stories or art set during any of the eras/franchise installments they appear in. You can also nominate the same character or relationship tag in multiple eras, and then request both Star Wars Original Trilogy and Star Wars Sequel Trilogy, for example.