Generally it is desirable to mark cross references in Paratext so that a user on a digital tool can locate that reference. However, Paratext only allows one form for the book name. When a project is set to use abbreviations for the cross-references, but occasionally uses the full name, this can be handled by using the | (pipe).
En Éxodo 20:11 no se da este significado,
In the above example, marking the text with \xt ...\xt* will result in an error. The correct way to mark the text would be:
En \xt Éxodo 20:11|EXO 20:11\xt* no se da este significado,
The text following the | should be the three character code for the book (upper or lower case).